Câu hỏi: The price of electricity is going up _____ August.

A. in

B. on

C. at

D. of

Câu 1: Helen had said goodbye to everybody in the class _____ she left for the hometown.

A. after

B. before

C. and

D. for

Câu 2: The children are really excited _____ their summer vacation.

A. on

B. of

C. to

D. about

Câu 3: John missed a lot of lessons. He was ill _____ January to March.

A. on

B. from

C. of

D. in

Câu 4: They came to visit us _____ my birthday.

A. at

B. on

C. to

D. of

Câu 5: Did you have a good time _____ Christmas?

A. at

B. in

C. for

D. on

Câu 6: I am sure he didn't break the plate ______ purpose.

A. in

B. at

C. for

D. on