Câu hỏi: The two children blamed each other ...... the window.

A. to break

B. breaking

C. for breaking

D. having broken

Câu 1: A hydroelectric dam ______________ in this area now.

A. is building

B. is being built

C. build

D. was built

Câu 2: The boy found a wallet in the street, and then he ...... to return it to the loser.

A. tried

B. had tried

C. was trying

D. had been trying

Câu 3: People are destroying the air by adding ...... to it.

A. pollutants

B. polluters

C. pollution

D. polluted

Câu 4: The film _______ by the time we ________ to the cinema.

A. already began - got

B. have already begun - got

C. had already begun - got

D. already began - had got

Câu 5: I threw my old trainers and bought some new .................. .

A. ones

B. one

C. some

D. any

Câu 6: The waste from the chemical factory is extremely .......

A. harm

B. harmful

C. unharmed

D. harmless