Ⅱ. Appliance of Language points（45分）
Section A （15分）
Directions: Beneath each of the following sentences there are four choices marked A, B, C and D. Choose the answer that best completes the sentence.
21. I’m convinced that the possibility really exists ____ China will be able to solve the problem of pollution well.
A. how B. that C. which D. whether
22. I really enjoyed the concert and never before ______ a concert would be so much amazing.
A. did I think B. I thought C. I had thought D. had I thought
23. — You look tired, what’s wrong?
— I _____ an important examination these days.
A. am preparing for B. am preparing
C. have prepared D. have prepared for
