(2013·安徽省芜湖三校一模)A recent study has found that the number of smokers ________ sharply over the past five years.
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A
is increasing
B
are increasing
C
has been increasing
D
have been increasing
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--- Why does the lake smell terrible?--- Because large quantities of water _________.
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A
have polluted
B
is being polluted
C
has been polluted
D
have been polluted
Michael knew he would certainly get ______ if he was late home.
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A
shouting at
B
shouted at
C
to shout at
D
to be shouted at
Would you please keep silent? The news that the milk contains a harmful chemical _________and I want to listen. 
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A
has been broadcast
B
is being broadcast
C
is broadcast
D
is broadcasting