题目内容：

根据句意和汉语注释，写出单词的正确形式

1.Lin Tao has a pair of _____________ (微笑的)eyes behind his round glasses.

2.There are many kinds of different ___________ (语言) in the world.

3.Do you think these books are those ___________(青少年) over there?

4.I think good friends should be _________(幽默). They can tell you funny jokes.

5.She has big bright eyes and long ________(笔直)hair.