The national exam begins at eight in the morning on a Monday.
The national exam begins ___ eight in the morning.
Elige una opción para comprobar tu respuesta.
Respuesta correcta: C)at
💡 Explicación
English uses at for clock times, on for days and dates, in for months, seasons and parts of the day, and for durations. Deciding which one applies is a matter of what kind of time expression is being named.
Ver respuesta
Respuesta correcta: C)at
A)inNo. 'in' is used with periods of time such as the morning, the afternoon or the year, not with a clock time.
B)onNo. 'on' is used with days and dates, so it cannot introduce an hour of the day in this sentence.
C)atCorrect! A clock time takes the preposition 'at', because the expression names a precise point within the day rather than a duration.
D)forNo. 'for' expresses a duration of time, and the sentence names a starting point rather than a length of time.
💡 Explicación
English uses at for clock times, on for days and dates, in for months, seasons and parts of the day, and for durations. Deciding which one applies is a matter of what kind of time expression is being named.
Pregunta 2
Pregunta 2 · D3Bloom: Apply
The children return to school in September after the summer holidays.
The children return to school ___ September after the summer holidays.
Elige una opción para comprobar tu respuesta.
Respuesta correcta: A)in
💡 Explicación
The preposition in covers the largest category of time expressions, from months and years to parts of the day such as the morning. It contrasts with at for clock times and on for days and dates.
Ver respuesta
Respuesta correcta: A)in
A)inCorrect! Months, years, seasons and parts of the day all take the preposition 'in', which is the widest of the time prepositions.
B)atNo. 'at' is used with clock times and with specific points, not with a month of the calendar.
C)onNo. 'on' is used with days and dates, and September is a month rather than a day.
D)sinceNo. 'since' marks a starting point that continues up to the present, and the sentence names a recurring event rather than that stretch of time.
💡 Explicación
The preposition in covers the largest category of time expressions, from months and years to parts of the day such as the morning. It contrasts with at for clock times and on for days and dates.
Pregunta 3
Pregunta 3 · D3Bloom: Understand
The library is on the corner of the plaza, next to the cathedral.
The library is ___ the corner of the plaza.
Elige una opción para comprobar tu respuesta.
Respuesta correcta: C)on
💡 Explicación
Place prepositions divide the physical space differently: in for interiors, on for surfaces and lines, at for points. Corners, walls, floors and squares all take on, while rooms, cities and countries take in.
Ver respuesta
Respuesta correcta: C)on
A)inNo. 'in' is used for enclosed space such as a room or a city, and a corner on a plaza is described with 'on'.
B)atNo. 'at' is used for a precise point such as a single building or a meeting place, not for a surface position.
C)onCorrect! 'on' is the preposition for a surface or a line, and it is also used for a location within a street or a square.
D)toNo. 'to' shows movement towards a place and cannot describe where a building stands.
💡 Explicación
Place prepositions divide the physical space differently: in for interiors, on for surfaces and lines, at for points. Corners, walls, floors and squares all take on, while rooms, cities and countries take in.
Pregunta 4
Pregunta 4 · D4Bloom: Analyze
The conference will be held at the main auditorium of the university.
The conference will be held ___ the main auditorium of the university.
Elige una opción para comprobar tu respuesta.
Respuesta correcta: C)at
💡 Explicación
At is used when a place is treated as one point, typically a building or a venue. It is also the preposition of addresses, of public transport destinations and of events, which is why it appears with held, met and born.
Ver respuesta
Respuesta correcta: C)at
A)inNo. 'in' would place the event inside an enclosed or bounded area, but the sentence treats the auditorium as a single venue.
B)onNo. 'on' describes a surface such as a wall or a street, and an auditorium is a location rather than a surface.
C)atCorrect! 'At' is the preposition of a single point of location, which is how a venue such as an auditorium is named in English.
D)toNo. 'to' shows the direction of a movement and has no use in a statement about where an event takes place.
💡 Explicación
At is used when a place is treated as one point, typically a building or a venue. It is also the preposition of addresses, of public transport destinations and of events, which is why it appears with held, met and born.
Pregunta 5
Pregunta 5 · D3Bloom: Understand
He has lived in the same neighbourhood since he was a child.
He has lived in the same neighbourhood ___ he was a child.
Elige una opción para comprobar tu respuesta.
Respuesta correcta: A)since
💡 Explicación
Since names a starting point and for names a duration, and the two are frequently confused. With a perfect tense such as has lived, since he was a child says when the situation began, while for ten years says how long it has lasted.
Ver respuesta
Respuesta correcta: A)since
A)sinceCorrect! 'Since' marks the starting point of a situation that continues up to the present, which is the case with the present perfect here.
B)forNo. 'for' expresses a length of time, and the sentence gives a starting point rather than a duration.
C)duringNo. 'during' is used with a defined period or event, and it does not mark a continuation up to the present moment.
D)whileNo. 'while' introduces a subordinate time clause and needs a main clause, which the sentence does not provide.
💡 Explicación
Since names a starting point and for names a duration, and the two are frequently confused. With a perfect tense such as has lived, since he was a child says when the situation began, while for ten years says how long it has lasted.
Pregunta 6
Pregunta 6 · D4Bloom: Apply
The repair work continued for three weeks during the wettest months of the year.
The repair work continued ___ three weeks.
Elige una opción para comprobar tu respuesta.
Respuesta correcta: B)for
💡 Explicación
Durations are always introduced by for, whether the tense is perfect or not. The expression after for names a quantity of time such as three weeks, two hours or a long time, and never a calendar point.
Ver respuesta
Respuesta correcta: B)for
A)sinceNo. 'since' requires a starting point and marks a continuation to the present, while this sentence describes a completed period in the past.
B)forCorrect! 'For' is followed by a length of time, so 'for three weeks' states how long the work lasted.
C)atNo. 'at' is the preposition of clock times and of precise points, not of durations.
D)inNo. 'in' is used with months, years and parts of the day, and 'three weeks' is a duration rather than one of those.
💡 Explicación
Durations are always introduced by for, whether the tense is perfect or not. The expression after for names a quantity of time such as three weeks, two hours or a long time, and never a calendar point.
Pregunta 7
Pregunta 7 · D4Bloom: Analyze
The bus stop is opposite the hospital on the main avenue.
The bus stop is ___ the hospital on the main avenue.
Elige una opción para comprobar tu respuesta.
Respuesta correcta: A)opposite
💡 Explicación
English has a group of prepositions of relative position: opposite, behind, in front of, beside, between, above and below. They describe how one thing is placed with respect to another, and they need no verb of movement to work.
Ver respuesta
Respuesta correcta: A)opposite
A)oppositeCorrect! 'Opposite' is a preposition of relative position, and it describes the bus stop as facing the other side of the street from the hospital.
B)toNo. 'to' marks a direction of movement and would require a verb of motion, which the sentence does not contain.
C)betweenNo. 'between' requires two elements with the bus stop in the middle, and only one building is named in the sentence.
D)underNo. 'under' describes a position below something and does not fit the horizontal arrangement of two buildings on a street.
💡 Explicación
English has a group of prepositions of relative position: opposite, behind, in front of, beside, between, above and below. They describe how one thing is placed with respect to another, and they need no verb of movement to work.
Pregunta 8
Pregunta 8 · D4Bloom: Evaluate
The test will take place on the fifteenth of December in the main hall.
The test will take place ___ the fifteenth of December.
Elige una opción para comprobar tu respuesta.
Respuesta correcta: C)on
💡 Explicación
The rule for dates is that on goes with a day and in goes with the rest of the date. When the day is spelled out, as in the fifteenth of December, the whole expression is treated as a day and takes on.
Ver respuesta
Respuesta correcta: C)on
A)inNo. 'in' is used with months and years, but a day with its ordinal number takes 'on' in standard English.
B)atNo. 'at' is the preposition of clock times and of a single point, and a full date is expressed differently.
C)onCorrect! Days and dates take the preposition 'on', including the fifteenth of December, which is a day of the month.
D)byNo. 'by' marks a deadline or an agent, and the sentence states when the test happens rather than how late it may be.
💡 Explicación
The rule for dates is that on goes with a day and in goes with the rest of the date. When the day is spelled out, as in the fifteenth of December, the whole expression is treated as a day and takes on.
Pregunta 9
Pregunta 9 · D4Bloom: Analyze
She arrived at the airport two hours before her flight to Madrid.
She arrived ___ the airport two hours before her flight to Madrid.
Elige una opción para comprobar tu respuesta.
Respuesta correcta: B)at
💡 Explicación
A place that is regarded as one point takes at: at the airport, at the station, at school and at home. This is different from in, which is used when the destination is an area such as a city or a region.
Ver respuesta
Respuesta correcta: B)at
A)inNo. 'in' would place her inside a country or a room, and the sentence treats the airport as one arrival point.
B)atCorrect! 'At' is the preposition for a single point of destination such as an airport, a station or a venue.
C)onNo. 'on' describes a surface, and an airport is a location rather than a surface where something rests.
D)intoNo. 'into' marks movement from outside to inside, which is not the simple arrival described in the sentence.
💡 Explicación
A place that is regarded as one point takes at: at the airport, at the station, at school and at home. This is different from in, which is used when the destination is an area such as a city or a region.
Pregunta 10
Pregunta 10 · D4Bloom: Apply
The instruments are kept in a cabinet near the entrance of the laboratory.
The instruments are kept ___ a cabinet near the entrance of the laboratory.
Elige una opción para comprobar tu respuesta.
Respuesta correcta: D)in
💡 Explicación
In is the preposition of interiors and containers, and it also covers cities, regions and periods of time. The choice between in and on is really a question of whether the reference point is a boundary or a surface.
Ver respuesta
Respuesta correcta: D)in
A)onNo. 'on' would place them on the surface of the cabinet, while the sentence says they are stored inside a container.
B)atNo. 'at' is used for a single point, and a cabinet is a bounded interior rather than a single spot.
C)underNo. 'under' would place them below the cabinet, which is not what the sentence describes.
D)inCorrect! 'In' marks an enclosed interior, and a cabinet is the kind of container that requires the preposition 'in'.
💡 Explicación
In is the preposition of interiors and containers, and it also covers cities, regions and periods of time. The choice between in and on is really a question of whether the reference point is a boundary or a surface.
Pregunta 11
Pregunta 11 · D4Bloom: Evaluate
The pupils must be at school before eight every morning this term.
The pupils must be ___ school before eight every morning this term.
Elige una opción para comprobar tu respuesta.
Respuesta correcta: A)at
💡 Explicación
Several places have a fixed preposition in English: at school, at home, at work, in prison and in hospital. These expressions describe the activity or condition rather than the geometry of the location.
Ver respuesta
Respuesta correcta: A)at
A)atCorrect! The fixed expression 'at school' treats the institution as one point of location, and it is the standard form in this context.
B)inNo. 'in school' would suggest being inside a building for some purpose, and the sentence refers to being present at the place of study as such.
C)toNo. 'to' marks a direction of movement and would need a verb such as go, which the sentence does not use.
D)onNo. 'on' describes a surface and has no fixed use with school as a place of study.
💡 Explicación
Several places have a fixed preposition in English: at school, at home, at work, in prison and in hospital. These expressions describe the activity or condition rather than the geometry of the location.
Pregunta 12
Pregunta 12 · D4Bloom: Analyze
The examination will last two hours and it cannot be extended.
The examination will last ___ two hours.
Elige una opción para comprobar tu respuesta.
Respuesta correcta: B)for
💡 Explicación
For introduces durations in both perfect and non-perfect contexts, and it is the only preposition that can be followed directly by a phrase such as two hours or a long time. Since, by contrast, always needs a starting point.
Ver respuesta
Respuesta correcta: B)for
A)sinceNo. 'since' marks a starting point in a continuing situation, and a scheduled length of time is expressed with 'for'.
B)forCorrect! 'For' introduces the duration of an event, and two hours is exactly the kind of length of time it can follow.
C)duringNo. 'during' is used with a defined period or event and does not introduce a bare duration such as 'two hours'.
D)whileNo. 'while' introduces a time clause and needs a main clause, so it cannot stand in the slot of this preposition here.
💡 Explicación
For introduces durations in both perfect and non-perfect contexts, and it is the only preposition that can be followed directly by a phrase such as two hours or a long time. Since, by contrast, always needs a starting point.
Pregunta 13
Pregunta 13 · D4Bloom: Apply
The market on Plaza Grande opens every Saturday in the early morning.
The market on Plaza Grande opens every Saturday ___ the early morning.
Elige una opción para comprobar tu respuesta.
Respuesta correcta: B)in
💡 Explicación
Parts of the day are treated as containers of time and take in: in the morning, in the afternoon, in the evening. The exceptions are the fixed phrases at night and at noon, which are so established that they are treated as single points.
Ver respuesta
Respuesta correcta: B)in
A)atNo. 'at' is used with a clock time, and 'the early morning' names a period of the day rather than an hour.
B)inCorrect! Parts of the day such as the morning, the afternoon and the evening take the preposition 'in'.
C)onNo. 'on' belongs to the day itself, which is already expressed by 'every Saturday' in the same sentence.
D)forNo. 'for' would require a duration, and the sentence names a part of the day rather than a length of time.
💡 Explicación
Parts of the day are treated as containers of time and take in: in the morning, in the afternoon, in the evening. The exceptions are the fixed phrases at night and at noon, which are so established that they are treated as single points.
Pregunta 14
Pregunta 14 · D4Bloom: Apply
The bell rings at the end of each lesson and the pupils go out into the corridor.
The bell rings ___ the end of each lesson.
Elige una opción para comprobar tu respuesta.
Respuesta correcta: D)at
💡 Explicación
Expressions that name a moment, such as the end, the start, noon and midnight, take at. This is a small but very consistent family, and it is the reason a sentence about the end of a lesson never uses in.
Ver respuesta
Respuesta correcta: D)at
A)duringNo. 'during' is followed by a noun naming a period or event, and here the phrase is itself a point rather than the surrounding period.
B)withinNo. 'within' marks a limit that something stays inside, and the sentence names a moment rather than a boundary.
C)sinceNo. 'since' marks the start of a situation that continues to the present, which has no role in a daily timetable.
D)atCorrect! 'At' is the preposition of a point in time, and the end of a lesson is such a point rather than a duration.
💡 Explicación
Expressions that name a moment, such as the end, the start, noon and midnight, take at. This is a small but very consistent family, and it is the reason a sentence about the end of a lesson never uses in.
Pregunta 15
Pregunta 15 · D4Bloom: Analyze
The bridge over the river was closed for repairs during the whole of August.
The bridge ___ the river was closed for repairs during the whole of August.
Elige una opción para comprobar tu respuesta.
Respuesta correcta: C)over
💡 Explicación
Over, under, above and below describe vertical position, and they are used constantly with bridges, roads and other structures that cross a space. In this sentence over also carries the idea of extending across.
Ver respuesta
Respuesta correcta: C)over
A)inNo. 'in' would place the bridge inside a space such as a room, but the sentence describes a crossing above a river.
B)underNo. 'under' would place the bridge below the river, which is the opposite of what a bridge does.
C)overCorrect! 'Over' expresses a position above something and at the same time the crossing relationship that defines a bridge.
D)betweenNo. 'between' requires two named elements on either side, and the sentence names only the river.
💡 Explicación
Over, under, above and below describe vertical position, and they are used constantly with bridges, roads and other structures that cross a space. In this sentence over also carries the idea of extending across.
Pregunta 16
Pregunta 16 · D4Bloom: Evaluate
The students will receive their certificates at the end of the academic year.
The students will receive their certificates ___ the end of the academic year.
Elige una opción para comprobar tu respuesta.
Respuesta correcta: B)at
💡 Explicación
At covers both clock times and abstract points in a period, which is why at the end, at the beginning and at noon all behave in the same way. End expressions are a small but very reliable family in the use of at.
Ver respuesta
Respuesta correcta: B)at
A)inNo. 'in' can be used with the year but not normally with a point such as the end of a period, which is named with 'at'.
B)atCorrect! A point in time, such as the end of a period or a named moment, takes the preposition 'at'.
C)toNo. 'to' can follow an end to indicate a range, but here it would need a second time expression to close the interval.
D)byNo. 'by' marks a deadline no later than the moment mentioned, and the sentence names an exact point rather than a limit.
💡 Explicación
At covers both clock times and abstract points in a period, which is why at the end, at the beginning and at noon all behave in the same way. End expressions are a small but very reliable family in the use of at.
Pregunta 17
Pregunta 17 · D4Bloom: Analyze
The old theatre stands between the cathedral and the government palace.
The old theatre stands ___ the cathedral and the government palace.
Elige una opción para comprobar tu respuesta.
Respuesta correcta: D)between
💡 Explicación
Between names a position in the middle of two elements, while among names a position inside a group of three or more. Both are prepositions of relative position and work without a verb of movement.
Ver respuesta
Respuesta correcta: D)between
A)amongNo. 'among' refers to a group of more than two items, and the sentence places the theatre between exactly two buildings.
B)behindNo. 'behind' would place the theatre at the back of one of the buildings, which the sentence does not claim.
C)besideNo. 'Beside' means next to a single element, and the sentence gives two elements with the theatre in the middle.
D)betweenCorrect! 'Between' takes exactly two elements and places the subject in the middle of them, which is the arrangement described.
💡 Explicación
Between names a position in the middle of two elements, while among names a position inside a group of three or more. Both are prepositions of relative position and work without a verb of movement.
Pregunta 18
Pregunta 18 · D4Bloom: Apply
The reading list for the term includes three novels written in the twentieth century.
The reading list for the term includes three novels written ___ the twentieth century.
Elige una opción para comprobar tu respuesta.
Respuesta correcta: A)in
💡 Explicación
Long periods of time, from decades to eras, behave like years and take in. The difference between these and clock times is one of span, and English signals it through the choice of preposition.
Ver respuesta
Respuesta correcta: A)in
A)inCorrect! Centuries, decades and long historical periods take the preposition 'in', like months and years.
B)atNo. 'at' is the preposition of a precise point in time, and a century is a span of years rather than a point.
C)onNo. 'on' is used with days and dates, and the century here functions more like a year or a season.
D)forNo. 'for' would require a duration to measure, and the century is used as the period in which the novels were written.
💡 Explicación
Long periods of time, from decades to eras, behave like years and take in. The difference between these and clock times is one of span, and English signals it through the choice of preposition.
Pregunta 19
Pregunta 19 · D4Bloom: Evaluate
The new stadium is next to the old railway station on the north side of the city.
The new stadium is next ___ the old railway station on the north side of the city.
Elige una opción para comprobar tu respuesta.
Respuesta correcta: D)to
💡 Explicación
Words such as next, close, near and opposite all take the preposition to. They describe distance between two points, and English expresses the relation with a preposition rather than with a comparative adjective in these fixed collocations.
Ver respuesta
Respuesta correcta: D)to
A)ofNo. 'of' expresses belonging or origin and cannot describe a position next to another building.
B)forNo. 'for' marks a purpose or a destination and has no spatial use in a statement about position.
C)sinceNo. 'since' is a preposition of time and cannot describe the spatial relation between two buildings.
D)toCorrect! 'Next to' is the standard expression for adjacency, and 'to' is the preposition that carries that meaning of nearness.
💡 Explicación
Words such as next, close, near and opposite all take the preposition to. They describe distance between two points, and English expresses the relation with a preposition rather than with a comparative adjective in these fixed collocations.
Pregunta 20
Pregunta 20 · D4Bloom: Analyze
The seminar will not begin until the dean arrives at the faculty building.
The seminar will not begin ___ the dean arrives at the faculty building.
Elige una opción para comprobar tu respuesta.
Respuesta correcta: D)until
💡 Explicación
Until marks an end point, so it is common with not, no longer and hardly, all of which place an action before a limit. Since marks a starting point instead, and the two words answer different questions about time.
Ver respuesta
Respuesta correcta: D)until
A)asNo. 'as' introduces a comparison of two actions happening at the same time, and the sentence states a delay rather than a coincidence.
B)sinceNo. 'since' marks the beginning of a situation that continues to the present, and no such continuing situation appears in the sentence.
C)whileNo. 'while' introduces a time clause and needs a main clause, whereas 'until' is followed by a complete clause on its own.
D)untilCorrect! 'Until' marks the point at which a negative or limiting clause stops being in effect, which is the sense of 'not begin until' here.
💡 Explicación
Until marks an end point, so it is common with not, no longer and hardly, all of which place an action before a limit. Since marks a starting point instead, and the two words answer different questions about time.
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