Câu hỏi: ……………fax transmission is commonly used in most offices.

A. A

B. An

C. The

D. x

Câu 1: Let’s _________ water by turning off tapes when not using.

A. save

B. to save

C. saving

D. saved

Câu 2: The two children blamed each other ...... the window.

A. to break

B. breaking

C. for breaking

D. having broken

Câu 3: The leopard is _________ the threat of extinction.

A. in

B. on

C. under

D. below

Câu 4: 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 5: I don't remember ...... of the decision to change the company policy on vacations. When was it decided?

A. telling

B. being told

C. to tell

D. to be told

Câu 6: The ...... friendly products are designed not to harm the natural environment.

A. environment

B. environmental

C. environmentally

D. environmentalism