One theory, ________ suggested by Harvard University, is that humans began cooking their food, thereby releasing nutrients locked in the raw food and reducing the time needed to chew it.
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which
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as
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that
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what
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The fact has worried many scientists ______ the earth is becoming warmer and warmer these years.
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what
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which
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that
D
though
After Yang Liwei succeeded in circling the earth ,_______our astronauts desire to do is walk in space .
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where
B
what
C
that
D
How
He came to a point ______ there was no more road to follow, and before him he could see nothing but a thick forest.
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that
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what
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which
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where
__________ much difficulty we may meet with, we will finish the work in time.
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However
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Whatever
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Whichever
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Though