Câu hỏi: The pens made___________ plastic are very cheap.

A. by

B. with

C. of

D. to

Câu 1: If you look __________ the book, you can find what you need.

A. through 

B. up

C. after

D. by

Câu 2: A sign warned motorists ______ dangers.

A. of

B. for

C. about

D. a and c

Câu 3: We congratulate you ___________ your successful flight.

A. on

B. about

C. by

D. with

Câu 4: Mary always take good care__________ her children.

A. off

B. of

C. by

D. with

Câu 5: Do you believe _______ ghosts?

A. no preposition

B. in

C. on

D. at

Câu 6: She was very surprised ________ the grade she received.

A. at

B. on

C. of

D. about