题目内容：

根据句意，用单词的适当形式填空（5分）

1.It’s ________ (nature) that teenagers（青少年）may sometimes quarrel（争吵）with their parents.

2.We have  __________(little) snowfall this year than last year.

3.The tortoise is walking           .(slow)

4.Don’t forget to write down the _______(fishman) names.

5.You should prevent the hunters from  __________(kill) wild animals .