13. covered　　 14. press　 15. hurt　　 16. offered　 17. treated　 　18. declined

7. confidence　 　8. circle　 9. representatives　 10. rest　 11. near　 12. shelves　

1．medicine　 2. medical　 3. tie　 4. examined　　 5. energetic　 6. permitted　

1)科学家们对ADIS进行了长期的研究。

2)如果我是你，我就会帮助他。

3)他无意中发现了一个秘密。

4)我宁愿死也不嫁给他。

5)他哭了而不是笑。

Key:

9. I hurt my knee yesterday.

　 I ________ my knee yesterday.

8. I can’t think of a good idea.

　 I can’t ________ ________ _______ a good idea.

7. She always comes top in the exam.

　 She is always the _______ in the exam.

6. Next term we’ll have an English contest.

　 Next term we’ll have an English _____________

5. I have many friends.

　 I have ______ ________ friends.

4.　　 I am very angry with you.

I ________ you too much.