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She is very dear to us. We have been prepared to do_______it takes to save her life.
A．whicheverB．however C．whatever D．whoever

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．China is playing an important role in the world. That’s_______Laura has come to study Chinese.
A．becauseB．whyC．howD．that

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．The fact has worried many scientists ______ the earth is becoming warmer and warmer these years.
A．whatB．whichC．thatD．though

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How can they learn anything useful ______ they spend all their spare time playing online games?
A．whileB．unlessC．althoughD．when

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Earth is a rocky planet _______ liquid water, which is necessary for life, can exist.
A．asB．whichC．whereD．when

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. Such women _____ know Tom thought he was charming.
A．thatB．whichC．/D．as

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I get into the habit of surfing the Internet___I can find a lot of useful information.
A．whichB．thatC．whenD．where

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There are many people _______ behave so well all time _______they are respected
by everyone around.
A．that; whoB．who; thatC．who; whichD．that; when

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. ____________ the dinosaurs disappeared still remains a mystery.
A．whetherB．thatC．ifD．Why

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China is playing an important role in the world. That’s      Laura has come to study Chinese.
A．becauseB．whyC．howD．that

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