Câu hỏi: He insisted ______ taking us dinner.

A. on

B. in

C. over

D. of

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: A sign warned motorists ______ dangers.

A. of

B. for

C. about

D. a and c

Câu 3: She always takes good care _______ her children.

A. for

B. in

C. of

D. with

Câu 4: Smoking is harmful _____________ our health.

A. to

B. by

C. against

D. with

Câu 5: China became the third country in the world to be able to independently carry __________ manned space flights.

A. by

B. up

C. on

D. out

Câu 6: Our study is very important____________ our future and useful_____________ our country.

A. for/ for

B. to/ to

C. for/ to

D. to/ for