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(2013·高考北京卷)Don’t turn off the computer before closing all programs，________you could have problems.
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A
or
B
and
C
but
D
so
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 He has been in bed ______ he fell off his bike a week ago.             
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A
even if
B
soon after
C
now that
D
ever since
(2014·兰州高三质检)Our country is developing at an amazing speed，which is________makes me feel so proud.
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A
what　
B
why
C
that　
D
where
Remember to give me a call ______ you arrive in Beijing.
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A
as soon as
B
as if
C
since
D
even if
I have heard a lot of good things about you ________ I came back from abroad.
#30243
A
since
B
until
C
before
D
when
In time we reached a stage        we had more young readers than old ones．
#33139
A
where
B
how
C
who
D
what