单项选择题

(Annoying) at the long check-out lines, the shopper began (to sigh) loudly, tap his (foot), and (glance) at his watch.

A．Annoying
B．to sigh
C．foot
D．glance
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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
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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