根据汉语意义，用适当的短语或单词完成英语句子。

1. 卡通人物被全世界许许多多的学生所喜爱。

    Cartoon characters _____ by millions of students all over the world.

2. 因为唐明口语非常好，所以同外国人交流起来他没有任何困难。

    Because his spoken English is very good, Tang Ming has _____ with foreigners.

3. 上网聊天，不仅浪费时间，而且有害健康。

     _____ on the Internet is _____ wasting time, _____ doing harm to our health.

4. 保护环境是我们每个人的责任。

    It is everyone's _____ our environment.

5. 为什么秋天没到树叶就变黄了？那全是空气污染所致。

    Why have almost all the leaves _____ yellow _____ autumn comes? That's all _____ the air pollution.