Câu hỏi: Concert tickets .................... at the box office.

A. is selling

B. sold

C. are sold

D. is sold

Câu 1: I can’t see it- it must ....................

A. have been taken

B. be taken

Câu 2: They are ........................ by the police at themoment.

A. questioned

B. being questioned

Câu 3: It ................ next week.

A. is been published

B. is being published

Câu 4: It .................. by next Friday.

A. has to be done

B. has been done

Câu 5: The day before yesterday we .............................a very bad storm.

A. had had

B. were having

C. had

D. have had

Câu 6: In a few months, the firm ....................... its production.

A. is increased

B. will be increasing

C. will be increased

D. has increasing