阅读下面对话，从方框中选择五个最适当的句子完成对话(其中有2个选项是多余的)。(本题共5小题，每小题2分，共10分)
Li Yang: Good morning. Mathew.
Mathew: Good morning, Li Yang. ________
Li Yang: There's still smog today. We'll have to go to school with face masks.
Mathew：______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.
Li Yang: _______
Mathew：Since PM2.5 is mainly caused by vehicles and factories，cars with large emissions should not be allowed and factories should be closely watched
Li Yang: ______We hope that more and more people will join us in making the blue skies return for good.
Mathew：_______

A. I hope so. B. Can you give any advice? C. I don't think so. D. What a pity! E. I agree. F. What's the weather like today? G. That's OK.