根据句意、汉语或首字母提示，补全单词，完成句子。

1. He w          the parcel by hand.

2. How many______ (磅) are these potatoes?

3. We are trying to s             the endangered plants and animals on the land.

4. The water in the small river is quite p            as a result, no fish lives in it.

5. I prefer to see animals in their natural h              rather than in the zoo.