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