单项选择题

There is never enough （）around.

A.going
B.goes
C.that goes
D.to go

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单项选择题

The driver had to stop because the （）of the fog made it difficult to see.

A.popularity
B.density
C.intensity
D.prosperity

单项选择题

The （）side is that it costs jobs，with factories only demand for a small proportion of the workforce when operated conventionally.

A.ill
B.leaky
C.flop
D.flip