--- The light in the office is still on.    --- Oh, I forgot _______. 
#98793
A
turning it off
B
turn it off
C
to turn it off
D
having turned it off
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   It’s hard for us to make a choice, which means we have not decided _____.
#97347
A
to take a step
B
to take which step
C
which step to take
D
to take what
There is nothing interesting   at present.
#97792
A
go on
B
going on
C
to go to
D
goes on