题目内容：

根据句意和汉语注释，写出单词的正确形式

1.Among all the books, the biology book is __________________(厚的).

2.Everyone knows that practice makes _____________(完美的).

3.Thank you for ____________(描述) the beauty in this area to us.

4.The wild animals in danger need lots of ____________(保护) most.