题目内容：

用括号内所给单词的适当形式填空。

1.The baby is very young．He has no _______ (tooth) now．

2.Yang Liwei is one of the _______ (hero) in my heart．

3.When the students heard the news,they were all ________．(excite)

4.He spends two hours _______ (exercise) every day．

5.I often see him _______ (dance)．