题目内容：

根据句意，在相应的横线上，写出括号内所给单词的适当形式。

1.It is getting more and more ________ (pollute). We should do something to solve the problem.

2.I don’t like the persons whose clothes are ________ (tidy).

3.They designed a car ________ (special) for disabled people.

4.Here is a list of the early ________ (settle) names. They have lived there for 30 years.