Câu hỏi: We areall aware____________ the importance of the environment protection.

A. of

B. about

C. to

D. of

Câu 1: Your friend is always complaining__________ her job.

A. with

B. about

C. of

D. to

Câu 2: I waited _____ 10 o'clock and then went home.

A. until

B. to

C. for

D. in

Câu 3: Courses like shoemaking or glass engraving provide people___________ practical skills they can do with their hands.

A. to

B. with

C. of

D. for

Câu 4: _____ the children left, the house was very quiet.

A. After

B. Before

C. On

D. To

Câu 5: The river Rhine flows _____ the North sea.

A. to

B. into

C. in

D. for

Câu 6: It was not a problem. We looked____________ his number in the telephone book.

A. up

B. for

C. to

D. after