单项选择题

The United States Department of Labor (enforces) laws that (promote) the welfare of wage earners, (improving) occupational conditions and (advance) employment opportunities.

A．enforces
B．promote
C．improving
D．advance
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单项选择题
On (each) side of the highway (was) hundreds of billboards (advertising) everything from modem motels to roadside stands that sell (fresh fruit) and bedspreads.
A．each
B．was
C．advertising
D．fresh fruit
单项选择题
(To) the (best of) my knowledge, the climate in Arizona is better all (the) (year-round) than (any) other state.
A．To
B．best of
C．year-round
D．any
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