Câu hỏi: Smoking is harmful _____________ our health.

A. to

B. by

C. against

D. with

Câu 1: If you look __________ the book, you can find what you need.

A. through 

B. up

C. after

D. by

Câu 2: Ken prefers Chinese food________ French food.

A. to

B. or

C. and

D. with

Câu 3: We congratulate you ___________ your successful flight.

A. on

B. about

C. by

D. with

Câu 4: He wore a hat, which made him look _______________ a spy.

A. like

B. up

C. after

D. back

Câu 5: Our study is very important____________ our future and useful_____________ our country.

A. for/ for

B. to/ to

C. for/ to

D. to/ for

Câu 6: Why don't you ask_____________ a pay increase?

A. for

B. by

C. to

D. with