The river, ______the bank are covered with trees, is very long.
#4972
A
whose
B
which
C
of which
D
which of
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.The plane ______, _______ all 200 people aboard.
#4771
A
survived; to kill
B
crashed; killing
C
missed; killed
D
balanced; and killing
They use computers to keep the traffic _______ smoothly. 
#5026
A
being run
B
run
C
to run
D
running