根据句意及首字母提示填词.

1. Animals are our good f_____. We must be friendly to them.

2. Lions are from south A_____. And pandas are form china.

3. I like dogs b_____ they are very friendly.

4. He l_____ in a small town.

5. How many h_____ are there in a day?

简述截肢后常见并发症。