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 Computers must be of great use to ________ doing the scientific research. 
#16786
A
these
B
whoever
C
those
D
whomever
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---Are the Smiths living in the house alone ?--- Yes, although they have three sons, _____ of them live with their parents.
#56685
A
neither
B
both
C
all
D
none
 You may depend on ____ that they are of much value.
#15134
A
that
B
it
C
these
D
them
No bread eaten by man is so sweet as ______earned by his own labour.
#16871
A
one
B
those
C
it
D
that
One of the students hasn’t prepared _____ lessons very well.
#16369
A
one’s
B
ones
C
their
D
his
 —Is there any vaccine(疫苗) against H1N1 flu that can be used on humans?—No, but scientists are working to develop ________ .
#16397
A
that
B
it
C
one
D
so
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