When the fire broke out, Mary didn't know ___.
#97806
A
what to do
B
what do
C
to do what
D
what thing to do
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 I wondered what great difficulty he had ________ the plan.
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A
to carry out
B
carrying out
C
carried out
D
with carrying out
Properly _______ with numbers, the books can be easily found.
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A
marked 
B
mark  
C
to mark  
D
marking
 Your cousin is said ________ a new computer program recently, but do you know when he will finish it?
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A
to design
B
designing
C
to have been designing
D
to have designed