Clothing made of man-made fibers has certain advantages over ______ made of natural fibers like cotton，wool or silk.
#15178
A
one
B
those
C
that
D
what
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Sarah made ______ to the airport just in time to catch her plane this morning.
#15680
A
herself
B
this
C
that
D
it
The group of the aged are close companions, and many of ______ have known each other for decades.
#16271
A
them
B
that
C
whom
D
what