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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单项选择题
He ______ the 8:25 train because he didn't leave home till 8:30.
A．couldn't have caught
B．ought to have caught
C．shouldn't have caught
D．mustn't have caught
单项选择题
-- There isn't any bread left.--Oh, ______ I'll buy some in the supermarket. I'm going there in a few minutes.
A．is there
B．isn't it
C．isn't there
D．is it
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