Answer: A) Aboard, about, above, around.
Explanation for this question is being written.
Answer: A) On
Answer: B) On
Answer: B) In
Answer: A) At, time.
Answer: A) Since
Answer: D) Preposition
Answer: C) With
Answer: A) By
Answer: C) Preposition
Answer: B) Off
Answer: A) At
Answer: A) After
Answer: B) Two months ago.
Answer: B) Since
Answer: A) In
Answer: D) Before
Answer: B) After
Answer: B) For is used to indicate a length of time.Since is used to talk about a point of time in the past.
Answer: C) For
Answer: C) After
Answer: C) On
Answer: B) Preposition
Answer: B) For
Answer: C) Since
Answer: D) In, at.
Answer: A) For
Answer: B) Since is for dates and for: duration of time.
Answer: B) At
Answer: B) Ahead
Answer: A) At the present.
Answer: A) Every
Answer: B) Hace
Answer: D) For
Answer: B) -
Answer: D) D
Answer: C) In
Answer: B) 2years