Câu hỏi: The streets are crowded (at/ in/ with/ of) vehicles at the rush hour.

A. at

B. in

C. with

D. of

Câu 1: Teachers are responsible (at/for/to/of) their teaching.

A. at

B. for

C. to

D. of

Câu 2: Your words are contrary (to/in/on/of) your acts.

A. to

B. in

C. on

D. of

Câu 3: Gas is made .......... coal.

A. of

B. from

C. with

D. to

Câu 4: I'm not acquainted (at/in/with/of) those flowers.

A. at

B. in

C. with

D. of

Câu 5: We are grateful (at/in/on/to) our teacher.

A. at

B. in

C. on

D. to

Câu 6: I shall wait .......... you.

A. about

B. by

C. to

D. for