摘要： It’s our duty to protect our environment.

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It’s our duty ________ the environment wherever you are.

A.
protect
B.
protects
C.
protecting
D.
to protect

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It’s our duty ______the environment.

A. protect
B. to protect
C. protecting
D. of protecting

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It’s our duty ________ the environment wherever you are.

[　　]

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As for air pollution, the________, the________. It’s our duty to protect the environment.
A. less; better B. fewer; worse C. more; better

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用所给词的适当形式填空

It's our duty to help ________(protect) the environment.

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