Câu hỏi: 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 1: Maintaining biodiversity is important _______ us in many ways.

A. in

B. for

C. from

D. by

Câu 2: He worked hard ________ a mechanic for ten years before being appointed manager.

A. as

B. at

C. with

D. by

Câu 3: Governments have enacted laws to protect wildlife ________commercial trade and overhunting.

A. from

B. without

C. for

D. at

Câu 4: Don’t you know what happened _________ the people who went on holiday with us?

A. about

B. to

C. by

D. at

Câu 5: It is important to have someone that you can confide ________.

A. up

B. in

C. at

D. with

Câu 6: Not all books belong _________this class.

A. in

B. to

C. for

D. at