Câu hỏi: When I got to the office, I ----------- that I had forgot to lock the door.

A. realized

B. had realized

C. realize

D. have realized

Câu 1:  After he ------------ his driving test he bought a car.

A. had passed

B. pass

C. passed

D. passing

Câu 2: There is no red wine? I -------------- white, then.

A. am going to have

B. have

C. will have

D. am having

Câu 3: When she was 21 she -------------- across the United States.

A.  drove

B. drive

C. driven

D. was driving

Câu 4:  How long have you ------------- he was a liar.

A. been knowing

B. knew

C. know

D. known

Câu 5: -------------- study hard when you were at school?

A. Must you

B. Had you

C. Did you have to

D. Were you

Câu 6: She is tired because she ------------- all day.

A. is studied

B.  has been studying 

C. had been studying

D. studied