单项选择题

Vast amounts of money are being invested in the local market.

A．Enormous
B．Constant
C．Unknown
D．Sufficient
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单项选择题
A new water boiler was installed in our building last week, which could provide hot water to the students.
A．inspected carefully
B．placed in service
C．undertaken with care
D．undone casually
单项选择题
Unless the population growth stabilizes, environmentalists predict a worldwide starvation by the next decade.
A．famine
B．shortage
C．rebellion
D．infection
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