A feather falls slower than a stone only because the air holds the feather back more than it ______ the stone.
#74760
A
does
B
holds
C
will
D
is
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Young Lee learned some English when she stayed in America, and last year she ____ herself Japanese.
#81596
A
kept on teaching
B
went on teaching
C
kept on to teach
D
went on to teach
We should __________ primary importance to job training.
#69210
A
concentrate  
B
devote
C
attach
D
emphasize