The birds are in the sky. A. drinking B. talking C. eating D. flying——青夏教育精英家教网—

摘要： The birds are in the sky. A. drinking B. talking C. eating D. flying

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I think ______ is necessary ______ us to do something useful to protect the birds.

A. this; for B. it; of C. this; of D.it;for

I hear the birds _______.

A．sing

B．to sing

C．sings

D．singing

I think ______ is necessary ______ us to do something useful to protect the birds.

A. this; for B. it; of C. this; of D. it; for

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