--- I hear a number of workers in the factory ______ out of work.--- Yes, and the number _______ quite huge.
#85700
A
are; is
B
is; are
C
is; is
D
are; are
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Large quantities of polluted water_____ into the sea so that lots of fish died. 
#86296
A
is flowing
B
was flowing
C
are flowing
D
were flowing
---There______ a concert this evening.---Yes.Exciting news.
#43613
A
are going to be
B
is going to be
C
is going to have
D
will have