问题描述：
求大神解决几道英语适当形式填空
the engineer will be _____（in charge of)directing the building of the subway
when we____(look back),we can realize how much progress we have made
studies show the mp3 player people have___(be fond of)to enjoy music may be causing hearing loss in many people
the engineer will be _____（in charge of)directing the building of the subway
when we____(look back),we can realize how much progress we have made
studies show the mp3 player people have___(be fond of)to enjoy music may be causing hearing loss in many people
问题解答：
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