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Some researchers believe that there is no doubt ______ a cure for AIDS will be found.
#72535
A
which
B
that
C
what
D
whether
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When asked how he liked his job, he said he was happy _____ he was．
#69419
A
what
B
who
C
where
D
how
The Browns held _____ they called"family day"once each year.
#71935
A
that
B
what
C
which
D
when
_____________ you don’t like him is none of my business. 
#74041
A
That
B
Who
C
What
D
Whether
He loves his parents deeply, ________ are very kind to him.
#69736
A
both of them
B
both of who
C
whom
D
both of whom
One of them held the view ____ the book said was right.
#68584
A
what that
B
that what
C
that
D
whether