Câu hỏi: A sign warned motorists ______ dangers.

A. of

B. for

C. about

D. a and c

Câu 1: 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 2: How long have they been working _____________ the company?

A. for

B. at

C. in

D. on

Câu 3: Jane doesn’t spend much money ______ clothes.

A. over

B. about

C. at

D. on

Câu 4: Was your friend successful ___________ getting a loanfrom the bank?

A. in

B. by

C. with

D. about

Câu 5: She always takes good care _______ her children.

A. for

B. in

C. of

D. with

Câu 6: Many of the stories are based______________ rumor.

A. on

B. by

C. to

D. with