Economy is booming, so it is hard for some of the firms to enough labor , though their working conditions are rather good.
A. hire
B. fire
C. use
D. remend
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(答案→)A. hire
B. fire
C. use
D. remend
解析：动词辨析。A雇佣；B解雇；C使用；D推荐；结合句意可知A正确。句意：经济正在迅猛发展，所以尽管他们的工作条件相当好，对一些公司来说雇佣到足够的工人也很困难。