Wecanhavebluerskyifwecreateles

We can have ___ bluer sky if we create ___ less polluted world.

A．a. a

B．a, the

C．the, a

D．the, the

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“I’m ______ before you . Then you can have my seat.” With these words , he stood up.

A．getting up

B．getting on

C．getting off

D．getting out

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When do you think the conversation _____________?

A．take place

B．takes place

C．happen

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—I see. You mean working too hard makes one tired and ill.

A．not

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A．smoke

B．to smoke

C．smoking

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