Câu hỏi: Smoking is harmful _____________ our health.

A. to

B. by

C. against

D. with

Câu 1: How would the body react__________ the extreme changes in temperature?

A. by

B. to

C. with

D. about

Câu 2: He was in orbit around the Earth __________ a speed of more than 17,000 miles per hour.

A. at

B. in

C. by

D. on

Câu 3: A sign warned motorists ______ dangers.

A. of

B. for

C. about

D. a and c

Câu 4: Many of the stories are based______________ rumor.

A. on

B. by

C. to

D. with

Câu 5: We congratulate you ___________ your successful flight.

A. on

B. about

C. by

D. with

Câu 6: If you look __________ the book, you can find what you need.

A. through 

B. up

C. after

D. by