Câu hỏi: I would like to send these letters …………………..air mail.

A. in

B. with

C. by

D. over

Câu 1: People are destroying the air by adding ...... to it.

A. pollutants

B. polluters

C. pollution

D. polluted

Câu 2: Let’s _________ water by turning off tapes when not using.

A. save

B. to save

C. saving

D. saved

Câu 3: Express Money Transfer is one of the quickest ways ……..help us to send money.

A. who

B. whose

C. when

D. that

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: The leopard is _________ the threat of extinction.

A. in

B. on

C. under

D. below

Câu 6: After she ________ hospital, she had a long holiday.

A. leaves

B. is leaving

C. had left

D. has left