根据句意及首字母提示完成单词。

1. I sent my mother a m______ to tell her that I got to Beijing safely.

2. Why didn't you do your homework? Students are s______ to do their homework, you know.

3. When he got the ball, he quickly p______ it on to others.

4. Tom said to his mother,"Don't be m______ at me. I won't do it again."

5. Remember to r______ the library books on time.