The silence of the library is sometimes broken by a sudden cough or the sound of pages __________.
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A
turning
B
turned
C
being turned
D
having turned
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We will have modern equipment ______ things that are complicated. This will make things simple.      
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A
to assist us with
B
assist us to
C
to assist us in
D
assisting us with .
--- The light in the office is still on.    --- Oh, I forgot _______. 
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A
turning it off
B
turn it off
C
to turn it off
D
having turned it off