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: 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 2: Your hair badly needs…………, Tom! 

A. cut

B. cutting 

C. to cut

D. be cut

Câu 3: My mother never allows me to go out alone at night. 

A. I was not allowed to go out at night with my friends.

B. My mother never goes out with me at night.

C. My mother never lets me go out alone at night. 

D. According to my mother, going out alone at night is what I should do.

Câu 4: 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. 

Câu 5: Twenty five dollars…..too much to pay for that shirt. 

A. have

B. is

C. sound

D. seem 

Câu 6: 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