用所给词的适当形式填空。

1.  Kangaroos are _____ (play) and chimpanzees are _____ (noise).

2. I was _____ (surprise) to find hardly anyone in the zoo.

3. Visiting zoos are like _____ (live) textbooks for young people.

4. He _____ (use) to be _____ (call) "Little Tiger".

5. Liu Xiang's success is an _____ (inspire) to us all