题目内容：

根据句意、中文提示或英文释义,写出句中所缺单词，使句子通顺。

1.We should be brave enough to __________ (面对) all the difficulties.

2.When did Audrey __________ (come into) the film industry?

3.The students always ___________ (拒绝) to do so much homework every day.

4.The detective thought he had a criminal ___________.

5.Our earth is becoming more and more crowded and       (受污染的).