在下列各句的空白处填入一个最恰当的单词。
1. Cao Chong had a good way to_____ the big heavy elephant.
2. The room is too_____ for six persons to live in.
3. Miss Li taught us a lot of useful _____ for example, agree in with other people.
4. Manatees are very huge. They are about l,000 _____.
5. In the zoo, animals have to live in small _____.
6. Parents should _____ their children to behave well.
7. There isn't enough _____ left for the cows. They'll be hungry.
8. He is _____. He always fights with others.
9. _____ can't grow in the desert because there is no water there.
10. My grandfather is about sixty years old and his hair has turned _____.