Câu hỏi: I'd have bought Sam's car if I'd known he was selling it. 

A. I knew Sam wanted to sell his car.

B. I didn't buy Sam's car because I didn't know he was selling it.

C. I bought the car without knowing it was Sam's.

D. I'll buy the car as soon as Sam decides to sell it.

Câu 1: He survived the operation thanks to skilful surgery.

A. He survived because he was a skilful surgeon. 

B. Without skilful surgery, he would have died.

C. Because skilful surgery, he survived the operation

D. He died after the operation. 

Câu 2: I plan to come back to Korean, ………..we had a chance to visit ten years ago. 

A. which

B. where

C. that

D. in which

Câu 3: The holiday wouldn't have cost so much if they hadn't gone abroad. 

A. The holiday costs much because they have decided to go abroad. 

B. They went abroad for their holiday. That's why it cost so much. 

C. They didn't go abroad because they couldn’t afford the holiday.

D. They would like to go abroad though the holiday costs much. 

Câu 4: By next Friday, Sam……….five speeches. 

A. gives 

B. will give

C. will have given

D. has given

Câu 5: It was thought that the accident was caused by human error. 

A. People think that human error causes the accident. 

B. The accident was thought to be caused by human error. 

C. The accident is thought to cause human error

D. People thought that the accident is caused by human error. 

Câu 6: Not until I left home did I realize how much my father meant to me. 

A. I realized how much my father meant to me just when I was home.

B. I left home and didn't realize how much my father meant to me.

C. It was only when I left home that I realized how much my father meant to me. 

D. Before I left home, I had realized how much my father meant to me.