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: We are too late. The plane …………… off ten minutes ago.

A. has taken

B. took

C. had taken

D. was taken

Câu 2: I------------- your uncle tomorrow, so I’ll give him your note.

A. have seen

B. shall have seen

C. see

D. am going to see

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

A.  drove

B. drive

C. driven

D. was driving

Câu 4: -------------- study hard when you were at school?

A. Must you

B. Had you

C. Did you have to

D. Were you

Câu 5: “How many pages…………… so far?"

A. have you studied

B. did you study

C. do you study

D. had you studied

Câu 6: When the phone rang she ------------ a letter.

A. writes

B. willl write

C. has written

D. was writing