—How can I wake up that early? —Set the alarm at 3 o’clock, ________ you’ll make it.
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A
but
B
or
C
and
D
so
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________we went to visit Professor Smith, he________his research work.
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A
The first time; devoted to
B
Whenever; was concentrate on
C
For the first time; was busy with
D
Each time; was absorbed in
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
The most favorite room is the tidy study with a fireplace, _____we can watch TV and enjoy the nice scenery outside.
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A
where
B
when
C
that
D
which
___ children believe they can succeed, they will never become totally independent.
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A
Unless
B
Though
C
When
D
If
Before the conference, a new problem came up __________ could speak on behalf of our group.
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A
that
B
who
C
which
D
how