40. These wild flowers are so special that I would do ______ I can to save them.

　 A. whatever　　　 B. that　　　 C. which　　　 D. whichever

39. Some pictures of the river brought the days back to the old ______ many people swam in it.

　 A. when　　　 B. that　　　 C. who　　　 D. where

38. ---Hi, Tracy, you look tired.

　 ---I am tired. I ______ the living room all day.

　 A. painted　　　 B. had painted　　　 C. have painted　　　 D. have been painting

37. ---Sorry, young man, but you are drinking my cup of tea.

　 ---Oh, I’m terribly sorry. _____. These two cups look much the same.

　 A. I haven’t noticed　　　　 B. I’m not noticing

　 C. I don’t notice　　　　　　 D. I was not noticing

36. ---Did Jack come back early last night?

　 ---Yes. It was at eight o’clock ______ he arrived home.

　 A. before　　　 B. when　　　 C. that　　　 D. until