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

A. is selling

B. sold

C. are sold

D. is sold

Câu 1: In a few months, the firm ....................... its production.

A. is increased

B. will be increasing

C. will be increased

D. has increasing

Câu 2: Tropical fruits .................... by farmers in the lowland region.

A. are grown

B. grown

C. are growing

D. grow

Câu 3: It .................. by next Friday.

A. has to be done

B. has been done

Câu 4: Before leaving camp, the Boy Scouts .............. the fire.

A. were put out

B. had been put out

C. put out 

D. had putted out 

Câu 5: It ................. last week.

A. should be done

B. should have been done

Câu 6: I can’t see it- it must ....................

A. have been taken

B. be taken