Câu hỏi: He worked hard ________ a mechanic for ten years before being appointed manager.

A. as

B. at

C. with

D. by

Câu 1: When you pick _________a book for the first time, check that it is not too difficult.

A. in

B. since

C. on

D. up

Câu 2: You should pay more attention __________ what your teacher explains.

A. in

B. at

C. on

D. to

Câu 3: It is important to have someone that you can confide ________.

A. up

B. in

C. at

D. with

Câu 4: A game is divided ____________quarters.

A. from

B. into

C. at

D. of

Câu 5: He didn’t even have the intelligence to call _________ an ambulance.

A. to

B. for

C. by

D. with

Câu 6: Governments have enacted laws to protect wildlife ________commercial trade and overhunting.

A. from

B. without

C. for

D. at