根据首字母及汉语提示，完成下列单词的拼写，使句意明确，语言通顺。

1. He is really a _______(焦急的) because he lost his favorite book.

2. M_______ (医疗的) workers are badly needed in those earthquake-hit areas.

3. We had a class meeting and all of us a_______ (同意) to have a picnic.

4. It is impolite to l_______ (笑) at other's mistake.

5. Mike usually stays up late at night and is often s_______ (困倦的) in class.