Read and write. 读一读，选词填空。

1. I'm a          . 1 look like (看起来像) a wolf (狼), but I'm your good friend.

2. I'm a  ____. 1 have a round (圆的) head, and I look like a tiger (老虎). 

3. I'm a_____. I can say "quack, quack".

4. I'm a_____. I can say "oink, oink".