(2013·河北教学质检)After a year, doctors diagnosed him with a disease so rare ________ it affects just one in 8 million children.
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after
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that
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as
D
since
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____ regular exercise is very important, it’s never a good idea to exercise too close to bedtime.
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A
It
B
As
C
Although
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Unless
The fact that smoking is harmful to health is__________ most smokers admit．
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A
what
B
whether
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where
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that
We were having a meeting _________ suddenly someone knocked at the door.
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A
because
B
when
C
as
D
while