—Look at the man standing at the school gate. Is he your math teacher Mr. Brown?

—No, it be him. He has gone to Chengdu on business.

A. needn’t B. can’t C. may not D. mustn’t

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What can kites do for us? You might think they are just for fun, but kites can do a lot more.

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What to do

How to do it

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Science studies

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