22．Lawrence Craven, a doctor from the USA，is the author of several published reports, one of______ introduced the idea in 1953 ______aspirin could reduce the risk of heart attacks．
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A
them; when
B
which; that
C
what; that
D
which; when
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________ time went by, small clever animals covered the earth and have become the most important animals on the planet.
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With
B
As
C
Because
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. It is only when we cannot see clearly _____ we come to see ______ important our eyes are.
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A
that; what
B
which; what
C
that; how
D
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The house, ______walls are red, is where my grandfather used to live ten years ago.
#31106
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which
B
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C
whose
D
that
—What are you going to do this afternoon?—I’ll probably go for a walk later on________it stays fine.
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as far as
B
so long as
C
even if
D
as though