All the citizens strongly insist those found _____ "harmful" advertisements in the street should be punished strictly.
#96493
A
putting up
B
being put up
C
put up
D
to be putting up
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Unless________ to speak, you should remain silent at the meeting. 
#94058
A
invited
B
inviting
C
being invited
D
having invited
The math problem seems very easy, but in fact it is very difficult_______.
#90069
A
to work out
B
being worked out
C
working out
D
to be worked out.
She woke up, ___ a Young Pioner standing by his bed smiling.
#98665
A
in finding
B
to find
C
finding
D
to have found