teadoweneed?A、HowmanyB、Howlong

tea do we need?
A、How many B、How long C、How much

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Take a map with you while traveling ________ you have a guide or know the city well．

A．since

B．if

C．unless

D．because

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- It will be worse ________ we take action to protect the environment.

A．if

B．unless

C．until

D．when

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She has worked in this factory ______ she came here in 2010.

A． when

B． since

C．for

D．from

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-I’m afraid the meeting has begun. -Don’t worry. It ___ until the bell ____.

A．doesn’t begin ;rings	B．won’t begin ; will ring
C．won’t begin ;rings	D．doesn’t begin ;will ring

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In summer milk will quickly go bad _____it is put into a fridge.

A．though

B．unless

C．because

D．once

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