题目内容：

根据句意，写出括号内所给单词的适当形式。

1.It’s too early to draw a conclusion now. A _________ (far) discussion is still needed.

2.The small rivers in my hometown are much more _______ (pollute) than 10 years ago.

3.You can’t imagine how much difficulty I had _________ (achieve) the balance between my family and my work.

4.The terrible accident _________ (effect) him a lot and changed his dream of life.