Being a doctor is one of the few professions＿＿＿＿if you make a mistake，it can mean somebody's life．
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that
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which
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when
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where
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Schools in the south tend to be better equipped，_______those in the north are relatively poor.
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while
B
since
C
when
D
as
a bad habit is formed, it will take a long time to get rid of it．
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Ever since
B
While
C
Once
D
Even if
—— Where did Mary’s parents buy the beautiful vase? —— It was in the same village _______ they spent their holidays last year.
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that
B
when
C
as
D
where
It was quite a few years __________the accused was declared innocent and set free.
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since
B
that
C
when
D
before
You can get the best result ______you carry out the experiment under the desired conditions.
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what if
B
even if
C
only if
D
as if