A. that     B. which    C. as    D. what

37. Thinking___ you know___ in fact you don’t is a terrible mistake.
  A. that; that   B. what; what   C. that; what   D. what that

38. Whether ways will be found to stop pollution or not is just___ worries the public.
  A. why       B. which      C. that      D. what

39. Why don’t you bring___ to his attention that you are too busy to do it?
  A. that     B. what    C. that     D. it

40.___ David says sounds right to Helen. That’s why she has made up her mind to leave with him___ happens.
  A. whatever; whatever                B. No matter what; whatever 
　C. No matter what; No matter what     D. Whatever; however

Keys:

21—25 BABAD  26—30 ADBCC 31—35 BBDBC  36—40 DCDDA