单项选择题

Since his children have all grown up, he has nothing now.

A．to worry about
B．worrying about
C．to be worried
D．worried
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单项选择题
Of all the stories here, I like this one______. It's not interesting at all.
A．most
B．worst
C．best
D．least
单项选择题
______ is a good form of exercise for both young and old.
A．Walking
B．To walk
C．The walk
D．Walk
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