单项选择题

Mum wants to tell her boys ______.

A．how difficult it is to raise them
B．how difficult is it to raise them
C．how difficult to raise them
D．how difficult is to raise them
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单项选择题
Many a girl ______ dancing and singing at the center of the stadium.
A．are
B．is
C．be
D．am
单项选择题
More and more people realize we won't have clean water to drink unless something ______ soon.
A．was done
B．will be done
C．to be done
D．is done
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