Nowadays signs prohibiting smoking       a common sight in restaurants, tea houses and shopping malls.
#85581
A
are
B
is
C
were
D
was
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All possible means ____, but nothing can prevent the buildings ____.
#85899
A
has tried; from being pulled down
B
have tried; from pulling down
C
has been tried; from pulling down
D
have been tried; from being pulled down