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）。

Li Yang: Good morning, Mathew.

Mathew:  Good morning, Li Yang. 1.

Li Yang: There's still smog（雾霾）today. We'll have to go to school with face masks（口罩）．

Mathew:2.         According to the news, PM2.5 pollution is the main problem  with air pollution.

LiYang:  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: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.

LiYang:4.        We hope that more and more people will join us in making the blue skies return for good.

Mathew:5.

—What do you think of the lecture of Li Yang s Crazy English?

—I think it's_________，but someone thinks it's much too _______.

A．wonderful enough; bored                 B．enough wonderful; boring

C．wonderful enough; boring                D．enough wonderful; bored

---What do you think of the speech of Li Yang’s Crazy English?

     ---I think it’s ________, but my friend thinks it’s too ________.

       A. wonderful enough, bored           B. enough wonderful, boring

C. wonderful enough, boring         D. enough wonderful, bored