单项选择题

Such problems（）air pollution and traffic jams becoming more and more serious in some big cities.

A．like
B．about
C．as
D．of

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单项选择题
Most people make such mistakes（）in their whole life.

A．sometime
B．sometime
C．sometimes
D．sometimes
单项选择题
I’m trying to be more（）when I go shopping, and only buying what I really need.

A．economy
B．economic
C．economical
D．economics
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