根据句意，写出括号内所给单词的适当形式。
小题1:You can’t look down on the ___________(able), because it’s equal between people.
小题2:If you have difficulty in making a _______(decide),you can go and ask him for help.
小题3:The noise of the traffic drove Mr Smith much________(mad) night by night.
小题4:I guess these bags are those _________(direct). Please keep them in your office.
