根据对话内容，从方框中所给的七个选项中选出五个句子补全对话，使对话完整、通顺。并将所选标号在对话后面的横线上。
Li Yang: Good morning, Mathew.
Mathew: Good morning, Li Yang.
小题1:
Li Yang: There's still smog（雾霾）today. We'll have to go to school with face masks（口罩）．
Mathew: 小题2:
According to the news, PM2.5 pollution is the main problem with air pollution.
Li Yang: Yes, and air pollution has done harm to people's health.
Mathew: So the Chinese government and Chinese people must take action to fight it.
Ji Yang:
小题3:
Mathew: Since PM2.5 is mainly caused by vehicles（机动车）and factories, cars with large emissions（排放）should not be allowed and factories should be closely watched.
Li Yang:
小题4:
We hope that more and more people will join us in making the blue skies return for good.
Mathew:
小题5:
A. I hope so, too.
B. Can you give any advice?
C. I don't think so.
D. What a pity(遗憾).
E. I agree.
F. What's the weather like today?
G. That's OK.
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