21. Our society has changed and _____ in it.

A. so the people have B. the people have so

C. so have the people D. have the people so

22. Parking is a big problem， _____ .

A. the traffic is so B. is so the traffic

C. so the traffic is D. so is the traffic

23. You never told me you have seen the film， _____ .

A. had you B. didn‘t you

C. did you D. weren‘t you

24. Don‘t forget to post the letter for me， _____ ？

A. do you B. will you

C. are you D. can you

25. Not until I came to China ______ what kind of a country she is.

A. I knew B. I didn‘t know

C. I did know D. did I know

26. I don‘t believe you are a student now， ____ you？

A. did B. are

C. will D. don‘t

27. Do what you think is right， _____ they say.

A. however B. whatever

C. whichever D. if only

28. _____ is well known， light， like heat， is a form of energy.

A. It B. what

C. Just as D. As

29. We can hardly avoid making any mistakes in our work _____ hard we try.

A. whatever B. how

C. no matter D. however

30. They are _____ students that they all performed well in the nationwide examinations.

A. so diligent B. such diligent

C. so much diligent D. such very diligent