题目内容：

根据句意，用括号内所给单词的适当形式填空。

1.He said nothing but  ____(simple) looked at me.

2.He went to Tibet to teach for two years although he was already in his         (forty) .

3.He has such a heart full of  ____ (sad) that it’s hard for him to cheer up.

4.Our dream is to  ____ (creative) a whole new world for our children to live in freely.