atthedoorbeforeyouentertheoffi

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__________at the door before you enter the office，or you’ll be considered impolite

A．Knocking

B．Knocked

C．Knock

D．To knock

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To prevent the disease from spreading, all the infected（感染的）chicks were buried _______.

A．alive

B．lively

C．live

D．living

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The footprints on the floor __________ that someone had broken into their house while they were out.

A．recognized

B．forecast

C．indicated

D．observed

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Our country ________ great changes in the past 30 years and it is no longer________ it used to be.

A．went through; what	B．has gone through; that
C．experienced; that	D．has experienced; what

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Not everybody knows exercising too much can_________ serious pain and even injuries.

A．attach to	B．attend to
C．contribute to	D．devote to

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—Jane looks down today, what’s up?
—Well, ________happened between Jane and me is none of your business.

A．whichever	B．whatever
C．no matter which	D．no matter what

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