Câu hỏi: Do you think we’ll find a solution ___________ the problem?

A. about

B. for

C. to

D. with

Câu 1: The participants must find _______________ all the answers in order to go in the next round.

A. out

B. up

C. of

D. by

Câu 2: The teacher tried to explain the new formula ______________ his students.

A. to

B. for

C. with

D. by

Câu 3: He was accused _____________ having stolen a car.

A. for

B. to

C. of 

D. by

Câu 4: Have you washed your hands______________ having lunch?

A. before

B. after

C. during

D. for

Câu 5: In English lessons we always speak ___________ English.

A. by

B. in

C. to

D. with

Câu 6: This area is rich _________ oil.

A. by

B. to

C. at

D. in