题目内容：

根据句意和中文提示，写出句中所缺单词。

1.My brother is a football fan and he is ____________(狂热的) about football.

2.Please keep the ____________(秘密) for us.

3.Many pop stars _____________(出席) the charity show yesterday.

4.How many _____________ ( 书架 ) are there in your study ?

5.What_____________(工具) should I use to plant the trees and flowers?