题目内容：

根据句意，写出括号内所给单词的适当形式。

1.You can’t look down on the ___________(able), because it’s equal between people.

2.If you have difficulty in making a _______(decide),you can go and ask him for help.

3.The noise of the traffic drove Mr Smith much________(mad) night by night.

4.I guess these bags are those _________(direct). Please keep them in your office.