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
(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
单项选择题
It (soon) became (obviously) that (instead of) (being trained) to sing she would be trained as a dancer.
A．soon
B．obviously
C．instead of
D．being trained
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