8.　　　 We learn this ______ communicating ______ others.

7.　　　 Put what they know _____ better use.

6.　　　 The man died _____ want _____ water.

5.　　　 He occupied himself _____ writing letter.

4.　　　 Little by little I have found my neighbor ______ great help to my work and study.

3.　　　 I will go to attend the meeting on condition that it clears ______ tomorrow.

2.　　　 _____ more and more forests destroyed , some animals are facing the danger of dying out.

1.　　　 ---Thank you very much ______ helping to repair my computer.

---That’s all right. Thanks ______ your letter, I can come in time and repair it for you.

1．介词，副词填空

18. 1)C 2) D3) B4) D