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Some researchers believe that there is no doubt _______ a cure for AIDS will be found.
#67941
A
which
B
that
C
what
D
whether
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________there are a large number of chemical factories, the air is likely to be polluted.
#68049
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.
#70498
A
where
B
when
C
in which
D
that
____ printed, this science fiction will be popular among the students.
#67782
A
Before
B
Unless
C
When
D
Once
It was raining on the day_______ they arrived.
#69464
A
in which
B
on that
C
on which
D
where