One learns a knowledge by making mistakes and ______ them.
#92957
A
corrects
B
correct
C
to correct
D
correcting
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He works much harder than I, so the money he has made is       mine. 
#93255
A
twice so much that
B
twice as much as
C
as twice much as
D
as much as twice
. Rather than _______ on a crowded bus, I always prefer _____ an electric bicycle.
#93328
A
ride ; ride
B
riding ; ride
C
ride ; to ride
D
to ride ; riding
_________, the more expensive the camera, the better its quality.
#95196
A
General speaking
B
Speaking general
C
Generally speaking
D
Speaking generally