Water, which seems to be so simple and common, is ______ makes life possible.
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A
that
B
which
C
what
D
where
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The reason__________ their failure you know is__________ they didn't get fully prepared for the experiment．
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A
why, that
B
that, why
C
for, that
D
why, because
He kept yawning in class this morning. That is _____ he stayed up late doing his homework last night.
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A
why
B
how
C
because
D
whether
What is even more important is_____ the earth cooled down, water began to appear on its surface.
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A
that
B
that as
C
which
D
which as
What makes online shopping so popular is it shortens the distance between manufacturers and consumers．
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A
how
B
that
C
whether
D
why
I’m afraid he is more of a talker than a doer, which is _________ he never finishes anything.
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A
that
B
when
C
where
D
why