夏天从冷气十足的空调车出来，戴眼镜的同学眼镜片会变得模糊，这时因为车外比较热的__________（选填“空气”或“水蒸气”）遇到寒冷的眼镜片__________（填物态变化）成小水珠，从而使眼镜片模糊。

Many wives work outside their home because they ______.

A．want to be independent

B．don't want to stay at home

C．don't have to take care of their children

D．want to make money for their home