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綜合提升
一、從下面四個選項中選出一個最佳答案。
() 1. If we don't protect our environment, nobody ______ what will happen in the future.
A. know
B. knew
C. knows
D. have known
() 2. ______ of us likes to be alone during the Spring Festival. We all like to be with our family.
A. No one
B. None
C. Someone
D. Anyone
() 3. —I want to be a top student, so what should I do?
—First, you should do everything you can ______ on your lessons.
A. study hard
B. to study hard
C. studying hard
D. to study hardly
() 4. We should do ______ to help protect the environment. It's our duty to do so.
A. something useful
B. anything useful
C. useful something
D. useful anything
() 5. She is a hard-working teacher. ______ it was very late at night, she still went on working.
A. Because
B. Even 
C. Since
D. Although

二、從方框中選擇適當的句子補全對話，有兩項為多余選項。
Li Yang: Good morning, Mathew.
Mathew: Good morning, Li Yang. 1
Li Yang: There's still haze (霧霾) today. We'll have to go to school with face masks (口罩).
Mathew: 2According 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 Chinese government and Chinese people must take actions to fight it.
Li Yang: 3
Mathew: Since PM2.5 is mainly caused by vehicles and factories, cars with large emissions (排放) should not be allowed and factories should be closely watched.
Li Yang: 4We hope that more and more people will join us in making the blue skies return for good.
Mathew: 5If everyone makes a contribution to protecting the environment, the world will become more and more beautiful.
A. I hope so, too.
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.