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

A. for

B. at

C. in

D. on

Câu 1: She always takes good care _______ her children.

A. for

B. in

C. of

D. with

Câu 2: Many of the stories are based______________ rumor.

A. on

B. by

C. to

D. with

Câu 3: Why don't you ask_____________ a pay increase?

A. for

B. by

C. to

D. with

Câu 4: You should make use___________ the books you have.

A. of

B. by

C. to

D. up

Câu 5: We congratulate you ___________ your successful flight.

A. on

B. about

C. by

D. with

Câu 6: Do you believe _______ ghosts?

A. no preposition

B. in

C. on

D. at