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

A. for

B. at

C. in

D. on

Câu 1: Ken prefers Chinese food________ French food.

A. to

B. or

C. and

D. with

Câu 2: Most of the streets were named __________ national heroes.

A. after

B. with

C. by

D. up

Câu 3: The pens made___________ plastic are very cheap.

A. by

B. with

C. of

D. to

Câu 4: A sign warned motorists ______ dangers.

A. of

B. for

C. about

D. a and c

Câu 5: We might need more food, depending ____ how many people turn up.

A. for

B. on

C. at

D. with

Câu 6: She was very surprised ________ the grade she received.

A. at

B. on

C. of

D. about