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Mary liked to look back on her high—school days，     she thought were the happiest in her life．
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A
that
B
what
C
which
D
when
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________there are a large number of chemical factories, the air is likely to be polluted.
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A
Where
B
That　　　　
C
Though
D
As
________ is where he gets all his money from.
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A
What I can’t understand it
B
That I can’t understand
C
What I can’t understand
D
Which I can’t understand it
You should let your children play ______ you can see them.
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A
where
B
when
C
in which
D
that
____ printed, this science fiction will be popular among the students.
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A
Before
B
Unless
C
When
D
Once
It was raining on the day_______ they arrived.
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A
in which
B
on that
C
on which
D
where