44. I left my umbrella in my room. Could you wait ______ I go back to get it?

　 A. when　　　 B. if　　 C. while　 D. before

43. Lucy knew nothing about it ______ her sister told her.

　 A. because　　 B. until　 C. if　　 D. since

42. ______ my mother ______ my sister watches TV plays these days.

　 A. Either, not　 B. Both, and　 C. Neither, or　 　her, nor

41. The nurse doesn’t feel well today, ______ she still works very hard.

　 A. but　　　 B. and　　　 C. or　　　 D. when

40. Tom has been in the factory ______ he left school.

　 A. when　　　 B. since　　 C. as soon as　　 D. whether

39. He had ______ much work to do that he couldn’t go out.

　 A. so　　 B. much　　　　 C. as　　　 D. or

38. The two friends were ______ pleased to see each other that forgot everything.

　 A. so　　　　 B. too　　　　 C. very　　　 D. much

37. There was ______ smoke that they couldn’t see anything clearly.

　 A. too　　　 B. too many　　 C. so much　 D. so many

36. Woke hard, _______ you will fall behind.

　 A. or　　　 　　　 B. and　　　 C. so　　　 D. so but

35. Take more exercise, _______ you’ll be healthier.

　 A. and　　 B. or　　　 　 C. but