题目内容：

A) 根据句意，用括号中所给单词的适当形式填空，每空一词。

1.We must learn more ____(nature) disasters to prevent them.

2.Everyone should pay attention to ____(talk) politely on the Internet.

3.Please cheer _____(you) up with songs and games during the journey, boys and girls!

4.Many people don’t know what ways they can think of to____ (reduce) the pollution.

5.The scientist died in his ____(forty). What a pity! He should be taken good care of.