Answer: A) By
Explanation for this question is being written.
Answer: C) At
Answer: B) For
Answer: D) On Monday.
Answer: B) In
Answer: A) Until
Answer: C) In
Answer: A) At
Answer: A) At / in.
Answer: B) At
Answer: A) At; on.
Answer: A) In
Answer: B) It's a quarter past nine.
Answer: D) X
Answer: B) IN
Answer: D) According
Answer: A) A quarter to seven.
Answer: A) Since
Answer: A) IN
Answer: B) On
Answer: D) D
Answer: D) Twice a week.
Answer: A) On
Answer: B) FROM TO.
Answer: A) A-while
Answer: A) For
Answer: C) On
Answer: A) In; at; on.
Answer: C) On, at.
Answer: A) I walk to school in 15 minutes.