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Li Yang: Good morning, Mathew.

Mathew: Good morning, Li Yang. {#blank#}1{#/blank#}

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

Mathew: {#blank#}2{#/blank#} 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: {#blank#}3{#/blank#}

Mathew: Since PM2.5 is mainly caused by vehicles(车辆)and factories, cars with large emissions should not be allowed and factories should be closely watched.

Li Yang: {#blank#}4{#/blank#} We hope that more and more people will join us in making the blue skies return for good.

Mathew: {#blank#}5{#/blank#}

—No. Nothing special.

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