根据句意和首字母提示，填写单词。

1. I think my Chinese teacher is k _____ because he knows a lot.

2. You can get p _____ of information about Hainan Island on the Internet.

3. Only two raincoats are red, the r_____ are yellow.

4. David never stops talking. He is not a good l _____ at all.

5. Don't b _____ your father. He is working on the computer.