根据所给中文或首字母写出相应单词的正确形式。

1. When I began to sing, he laughed and made me e____________.

2. He said that he p_________ to stay at home rather than go with us.

3. He has been practicing these days, in p______________ for the match.

4. The club is for t______________ who are between 13 and 19 years old.

5. Mr. Tang enjoys writing. His works have e__________ him many good friends.

6. We are kept i___________ of what is happening in the world by reading newspapers and watching television.

7. I’ve tried, but I can’t open the door _________（无论如何）.

8. The tall man _______（弯腰） forward to listen to the little girl.

9. The center has over 300 scientists _____________(致力于) to doing research into DNA.

10. Taking weight-loss pills proves to be dangerous, as it _____________(包含) some chemicals which cause one’s liver to fail.