Not until ten o' clock______it was too late to return.
A. they realized
B. they did realize
C. did they realize
D. realized they
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A．plantB．situationC．surroundingsD．circumstance
A. plant
B. situation
C. surroundings
D. circumstance
______born in Chicago, the writer is most famous for his stories about New York City.
Although
B. Since
C. When
D. As
______him do this job by himself？
A. Why not let
B. Why not to let
C. Why don't let
D. Why you not to let
Experiments______that accurate measurements be made.
A. show
B. prove
C. demand
D. head
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