Scientists first______the idea of the atomic bomb in the 1930s.
A. competed
B. conceived
C. consumed
D. concealed
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In earlier days, local trade was______ more important.
A. most
B. very
C. much
D. too
You've made a mistake—you've______ the word.
A. left out
B. left off
C. left behind
D. left for
Hotels gradually became less popular because they usually did not have ______.
A. large enough rooms for big families
B. places for cars to park in
C. sufficient ground rooms
D. quiet and convenient units
There is something wrong with my washing machine. I must have it______.
A. check
B. checking
C. to check
D. checked
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