Câu hỏi: Have you washed your hands______________ having lunch?

A. before

B. after

C. during

D. for

Câu 1: The teacher tried to explain the new formula ______________ his students.

A. to

B. for

C. with

D. by

Câu 2: They cancelled the flight because _________________ the storm.

A. with

B. by

C. off

D. of

Câu 3: We could not play soccer due __________ the bad weather.

A. of

B. to

C. by

D. with

Câu 4: Do you think we’ll find a solution ___________ the problem?

A. about

B. for

C. to

D. with

Câu 5: Thank you very much____________ inviting me to your party.

A. on

B. by

C. to

D. for

Câu 6: He is retired. He lives________________ his pension.

A. by

B. on

C. with

D. to