Air pollution has become than before. We must do something to stop it.
A. serious B. more serious
C. most serious D. the most serious
－ season do you like better, spring or summer?
－Spring. It’s neither hot nor cold.
A. Which B. Who
C. What D. Whose
－I you for two years. Where have you been?
－To Africa.
A. didn’t see B. haven’t seen
C. don’t see D. won’t see
－What’s Tom doing now?
－He in the library.
A. is reading B. read
C. reads D. will read
－Let’s go swimming, Linda.
－It sounds good, I’m too busy.
A. so B. for
C. or D. but
－Tom, you read it in Chinese?
－Sorry, I can’t.
A. may B. can
C. must D. need
