Câu hỏi: A sign warned motorists ______ dangers.

A. of

B. for

C. about

D. a and c

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

A. for

B. at

C. in

D. on

Câu 2: She was very surprised ________ the grade she received.

A. at

B. on

C. of

D. about

Câu 3: 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 4: How would the body react__________ the extreme changes in temperature?

A. by

B. to

C. with

D. about

Câu 5: She was very upset ________ the news of her father’s death.

A. at

B. by

C. with

D. about

Câu 6: It was very nice__________ him to give me a lift.

A. of

B. by

C. to

D. on