Answer: B) At
Explanation for this question is being written.
Answer: A) For
Answer: C) At
Answer: A) After
Answer: B) For
Answer: A) At
Answer: A) Of
Answer: B) On
Answer: B) At 10 p.m.
Answer: C) During
Answer: D) -
Answer: B) Since
Answer: A) Ahead of.
Answer: B) In
Answer: C) I studied for three hours.
Answer: A) In
Answer: C) By
Answer: A) At, in.
Answer: A) Within
Answer: B) Preposition
Answer: B) Over
Answer: B) B
Answer: A) Before
Answer: B) For 20 years.
Answer: A) On
Answer: A) Since, for.
Answer: B) After
Answer: A) Since
Answer: B) By
Answer: B) Before
Answer: C) From
Answer: C) On
Answer: D) During, laid.
Answer: B) Days and dates.
Answer: B) The shop is open from 7 AM to 3 PM.