58. 每个人都应该为保护环境作贡献。

　　　 Everyone should __________________________ to ___________ the environment.

57. 告示提醒人们不要在这个池塘里游泳。

　　　 The notice ___________ people ______________ swim in this pool.

56. 无论发生什么，请不要放弃。

　　　 ___________________ happens, please don't _________________.

　　 The earth is our home and we must take good care of it. That is to say we must 　36　 the land, air and water clean. But man 　37　 　a lot of pollution on the earth since he first made a fire, washed his clothes in the river and threw waste or 　38　 　on the ground. Many years ago, pollution was not so serious 　39　 　there were not so many people.

　　 There was enough 　40　 　air, land and water. When the land or the river was dirty in one place, man moved to 　41　 　place. Man now, 　42　 　, is slowly polluting the whole world and there is neither enough clean air, nor clean land, nor clean water. The more people there are in one place, 　43　 　environment they maybe have.

　 　Perhaps you　 44　 it is endless for people to produce pollution. 　45　 , people have come to know the danger of pollution and more and more people are working hard to protect our earth.

36.A. have　　　　 　B. take　　　　　 C. watch　　 　　　D. keep

37. A. produced　　 　B. has produced　 　C. is producing　　 D. will produce

38. A. rubbish　　　 　B. dirty　　　　 　C. water　　　　　 D. food

39. A. so　　　　　 　B. if　　　 　　　　C. because　　 　　D. but

40. A. clean　　　 　　B. clear　　　　　 　C. dirty　　　　　 　D. drinking

41. A. other　　　 　B. the other　　 　　C. another　　　　 D. others

42. A. although　　 　B. however　　　　 C. too　　　　　　 D. but

43. A. the worst　　　 B. the worse　　　　 C. the bad　　　　 D. worse

44. A. are glad　　 　　B. are pleased　　　 　C. afraid　 　　　　D. are afraid

45. A. Quickly　　　 　B. Especially　 　　　C. Luckily　　　　 D. Angrily

35. I don't know if he______. If he ______, I will call you.

　 A. come, come　　　　　　　　　　 B. comes, comes

　 　C. will come, comes　　　　　　　　 D. comes, will come　

34. Could you tell me when ______ ?　　　　　　　　　　 　A. the train leave

　 B. the train leaves　　　　 　C. does the train leave　　　　　 D. leaves the train

33. ______ you practise, ______ you can do it.　　　　 A. The more, the faster

　 　B. The more, the fast　　　　 C. More, fast　 　　　D. The more, the more faster

32. I have never seen ______ before.　　　　　　　　　　　 A. so an interesting book　

　 B. so a book interesting　 　C. such an interesting book　 　D. such interesting book