5. In Vietnam, it often rains a lot _________ summer.

A. at

B. for

C. on

D. in

6. The journalist posted this article on the website yesterday, _________?

A. don’t they

B. didn’t they

C. didn’t he

D. doesn’t he

7. I wish my sister _________ harder for her examination.

A. worked                  

B. will work

C. has worked

D. works