题目内容：

根据句意和汉语注释，在答卷标有题号的横线上，写出单词的正确形式。

1.He seldom __________ (回复) to the e-mails his friends send him.

2.To get away from the polluted earth, humans are thinking about moving ________ (在某处) else outside it.

3.The girl has been ________________ (缺席的)from school for a week.

4.Good ________________ (发音) will impress others and make yourself confident.