4．多亏绿色长城，挽救了大量富饶的农田。

　 _____ ______ the Great Green Wall, a lot of_____ farm land _____ _____.

3．用这种方法，防止了水灾的发生。

　 _____ this _____, floods ________ _______.

2．你的作文明天必须交上来。

　 Your composition _______ _______ _______ _______ tomorrow.

　A)完成下列对话，每空一词。

　A: We want to plant trees on the hill _____1____ Tree Planting Day.

　B: Good! It’s the best time to plant trees, but do you know ___2_____ to plant trees?

　A: Yes, first we should ____3___ a hole large enough ___4____ the tree. Then we should knock a stick____5____ the earth next to the hole.

　B: What’s next?

　A: We will put the tree ____6_____ the hole, and put the earth ____7____ in the hole again. At last we must tie the tree _____8____ the top of the stick to keep it____9____.

　B: That’s right. Must the tree be watered as _____10_____ as possible?

　A: Of Course.

　B) 根据所给的中文完成下列句子(每空一词)。

1．春天到了，该植树了。

　 Spring ______, it’s time ________ _________ trees.

20. Where can the young trees be planted? ________ the lake.

　A. On　B. In　C. Along　D. Into

19. Many more trees will be planted ________ 2 years.

　 A. for　B. in　C. since　D. ago

18. Water the trees as _______ as possible.

　 A. many　B. more　C. often　D. much more

17. ______ she eats, _____ she’ll be.

　 A. More, fat　　B. The more, fatter

　 C. More, the fatter　D. The more, The fatter

16. The light in the room ______ before you leave.

　 A. must turn off　B. will turn off

　 C. are turned off　D. must be turned off

15. Planting trees is _______ hard work.

　 A. /　B. a　C. the　D. an