Answer: D) Would be.
Explanation for this question is being written.
Answer: A) Couldn't come, would arrive.
Answer: D) Backward in time.
Answer: A) He said, "I am going to the market." $\rightarrow$ He said that he was going to the market.
Answer: B) B
Answer: B) She said that she found her keys.
Answer: A) Visited
Answer: B) Had
Answer: A) Will go.
Answer: C) Would go, had.
Answer: C) New houses were being built.
Answer: A) Had read.
Answer: B) He had gone to the movies with his friends.
Answer: C) They noticed that we were watching them.
Answer: D) He could improve his English by practicing a lot with his friends.
Answer: B) The policeman asked what I was doing at that time.
Answer: B) Past perfect (have/has + v3).
Answer: B) Would be studying.
Answer: C) Had followed / would have been.
Answer: C) Knew
Answer: B) Have completed.
Answer: C) If I had not been.
Answer: B) We thought we would become vegetarians.
Answer: C) Anna said that she didn't like horror movies.
Answer: A) Correct
Answer: A) Could stop taking those pills.
Answer: D) Carl said he had seen that movie.
Answer: B) She was playing a game.
Answer: A) Use past tense to talk about present unreal.
Answer: B) They said that they had completed the project.
Answer: B) Were
Answer: A) Simple past + present perfect.
Answer: A) Was busy / was doing.
Answer: B) Do you know if he went to America?
Answer: D) 'd written.
Answer: A) SHE SAID SHE HAD TO BE MORE SENSIBLE AND STOP SAYING GOSSIPS.
Answer: A) He said that he had been a great tutor.
Answer: A) They said that they were excited about the trip.
Answer: B) Liked
Answer: B) She had been working hard.
Answer: B) He said to his mom that he needed her.
Answer: D) My friend told me he had lived in Panama the month before.
Answer: C) Marcos said he knew how to make pancakes for breakfast.
Answer: C) It is music that the man is learning.
Answer: C) He said that he would see you the next day.
Answer: B) Was going.
Answer: D) He said that he liked playing sports very much.
Answer: B) Pastperfect (no change).
Answer: C) Mr. Chi said he would go to Hue the following day.
Answer: B) She said that she was studying then.
Answer: B) False
Answer: A) Our teacher asked us what we were most worried about.
Answer: A) Past continuous.
Answer: C) Alex said we would have fun that weekend.
Answer: C) She said that she would finish her homework.
Answer: A) David said he was studying for the exam.
Answer: C) He said he translated the text.
Answer: D) My father told us that we should study and get a good division in the examination.
Answer: C) He said that he would call me the next day.
Answer: B) I didn't have much money so I didn't get Adi to go around the world.
Answer: B) She was.