Correct answer: B. off
Explanation:
The correct preposition here is “off”. We use “get off” when describing the action of leaving or disembarking from a vehicle, such as a train or bus.
Grammar Rule:
• “Off” is used with verbs like “get” to indicate the action of leaving or moving away from a vehicle or surface. For example, “He got off the train when he reaches Hyderabad” means that he left the train upon arriving in Hyderabad.
• “Of” is used for possession or association, not for describing movement from a vehicle.
• “Over” typically refers to movement across a surface or over something, but not for disembarking from a vehicle.
• “Beneath” refers to something below or under, but it doesn’t fit in this context of leaving a train.
Thus, “He got off the train when he reaches Hyderabad” is grammatically correct because “off” indicates the action of leaving the train.

Correct answer: D. of
Explanation:
The correct preposition here is “of”. We use “approve of” when expressing approval or disapproval regarding something.
• “Approve of” is the correct phrase to use when referring to being in favor of or against something, especially ideas or actions. For example, “I don’t approve of your resignation” means that the speaker disapproves of the action of resigning.
• “From” is used to indicate the origin or source, but it is not used with “approve.”
• “In” typically refers to location or states, not approval or disapproval.
• “On” is used for specific points or topics, but not for approval or disapproval.
Thus, “I don’t approve of your resignation” is grammatically correct because “of” is used with “approve” to express disapproval regarding a particular action.

Correct answer: D. at, in
Explanation:
The correct prepositions here are “at” and “in”.
• “At” is used when referring to a specific location or point, such as an airport. So, “He arrived at the airport” is the correct phrase.
• “In” is used when referring to time periods or specific occasions. “In time” means arriving early enough, or with enough time to spare. So, “in time for his plane” means he arrived early enough to catch his flight.
Grammar Rule:
• “At” is used for specific places or points, like an airport, station, or event.
• “In” is used for time-related expressions to indicate a specific period when something happens or is completed.
Thus, “He arrived at the airport in time for his plane” is grammatically correct.

Correct answer: B. with
Explanation:
The correct preposition here is “with”. We use “keep up with” when referring to matching someone else’s speed or pace.
• “With” is used after “keep up” to indicate the person or thing whose pace is being matched. For example, “I could not keep up with him” means that the speaker was unable to match the speed or movement of the other person.
• “For” is used for purpose or reason, but not for matching speed.
• “To” indicates direction or movement, but doesn’t apply to the phrase “keep up.”
• “In” refers to location or state, which doesn’t fit with the idea of matching someone’s pace.
Thus, “He went so fast I could not keep up with him” is grammatically correct because “with” is used to show the person whose pace the speaker is trying to match.

Correct answer: B. about
Explanation:
“About” is used after “get upset” to indicate what is causing the emotional reaction. For example, “You do not need to get upset about these little things” means that the speaker is advising not to be disturbed or angry over minor issues.
It also means ‘on’ the subject of.
Ex: Let us talk about something else.
In the given sentence ‘upset about something’ is a phrasal verb.
It means ‘worried and unhappy’.
Ex: She was looking very upset about something.
Other Options:
• “For” is used to indicate purpose or reason, but not in the context of emotional reactions.
• “Off” refers to removal or distance, which doesn’t fit here.
• “Of” is used to indicate possession or association, not emotional response.
Thus, “You do not need to get upset about these little things” is grammatically correct because “about” shows what is causing the upset.

Correct answer: C. by
Explanation:
The correct preposition here is “by”. We use “by” to indicate the unit in which something is sold.
• “By” is used when referring to the unit or measure in which something is sold, such as “by the dozen,” “by the pound,” or “by the piece.”
• “At” is used for specific prices or locations, but not for units of sale.
• “To” is used for direction or recipient, but not for indicating units.
• “In” is used to indicate something inside a container or location, but it doesn’t fit here.
There are some fixed prepositional phrases given below:
by the dint of, out of jealousy, in danger, by the dozen, owing to, on a trip, for a change, etc.
Ex: I went on a trip to Goa last month.
Thus, “Eggs are sold by the dozen” is grammatically correct because “by” expresses the quantity in which the eggs are sold.

Correct answer: D. At
Explanation:
The correct preposition here is “at”. We use “astonished at” when referring to the cause or reason for someone’s astonishment.
• “At” is used after “astonished” to introduce the cause or reason for the surprise. For example, “He was astonished at his failure” means that his failure was the cause of his astonishment.
• “With” refers to accompaniment or manner, not the cause of an emotional reaction.
• “For” indicates purpose or reason in other contexts but not for emotional reactions like astonishment.
• “In” is used to describe location or state but is not used after “astonished” in this context.

Correct answer: D. on
Explanation:
The correct preposition here is “on”. We use “on” when referring to being or traveling on a vehicle, such as a bicycle.
• “On” is used when referring to being on a mode of transportation, such as “on a bicycle,” “on a bus,” or “on a train.”
Ex: Some organizations passed on substantially less money to the candidates.
• “At” is used for specific locations or points, not for being on a vehicle.
• “In” is used for enclosed spaces, but not for being on a bicycle.
• “Above” refers to a higher position or direction, not movement on a vehicle.
Thus, “Manu passed me on her bicycle” is grammatically correct because “on” indicates that she was riding her bicycle.

Correct answer is A. by.
The preposition “by” is used to mean “according to” when referring to a source of information or a standard of measurement. In this context, “my watch” is the specific standard we are using to tell the time.
The phrase “by my watch” is a fixed expression used to state the time as shown on one’s personal timepiece.
Why the other options are incorrect:
• B. in: We use “in” for periods of time (e.g., “in the morning”), or for being inside a location. You cannot be “in” a watch.
• C. at: We use “at” for specific points in time (e.g., “at 9 o’clock”) or specific locations (e.g., “at the station”). It does not mean “according to.”
• D. into: This indicates movement towards the inside of something (e.g., “walk into the room”) or a transformation (e.g., “translate into English”). It is completely unrelated to telling time.
Examples:
• By my calculations, we should arrive in an hour.
• By this thermometer, it’s only 5 degrees outside.
• “What time is it?” “It’s half past five by my phone.”
Therefore, “It is 9 o’clock by my watch” is the correct and natural way to say that according to your watch, the time is 9.

Correct answer is D. on.
Grammar Rule and Explanation:
The preposition “on” is used for floors or levels of a building. It indicates a position on a surface, and in this context, the floor is treated as a surface you live on.
The standard rule is:
• on the second/third/etc. floor
• on the ground floor
Why the other options are incorrect:
• A. in: We use “in” for being inside a room or a space that has walls. While you are in your flat, the flat itself is located on a specific floor of the building.
• B. by: This indicates proximity (e.g., “by the window”) or method (e.g., “travel by car”). It does not describe which floor something is located.
• C. at: This is used for specific points or general locations (e.g., “at the top,” “at the cinema”). While you can say “I live at 123 Main Street,” you specify the floor on that building.
Examples:
• The library is on the third floor.
• She lives on the top floor of an old house.
• You’ll find the shirts on the second level of the mall.
Therefore, “Our flat is on the second floor of the building” is the grammatically correct way to state its location.