用括号内所给单词的适当形式填空。
1. Your friends would probably say you are a good _____ (listen).
2. I find it very _____ (help) to get a first-aid book at hand.
3. He is very _____ (confidence) and he believes he can do everything well.
4. If I felt some pain, I'd stop _____ (exercise).
5. Lizz gave me this ring. She _____ (be) very upset if I lost it.