题目内容：

词型转换：用括号中所给单词的适当形式填空。(共5小题；每小题2分，共10分）

1.The bus is ________ (crowd) . Let’s get on it .

2.I won’t believe in you unless you tell me the ________ (true).

3.Kangaroos are playful and polar bears are __________ (fur).

4.You are supposed to type ________ (quick) when you are chatting online.

5.Take the elevator to the _________ (nine) floor, you can find it.