Not until after 3 days did he ________ that he had made a mistake.
A. think
B. conscious
C. show
D. realize
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You have to ________ these materials better if you want to write the paper well.
A. receive
B. perform
C. organize
D. produce
Remember ________ the light when you leave the room.
A. turn off
B. to turn off
C. turning off
D. turned off
The teacher’s questions were challenging, but Smith answered them ________.
A. intelligent
B. diligence
C. intelligently
D. diligently
Smith has no money to buy a bike, ________ a car.
A. not mention
B. let alone
C. neither is
D. nor does