Question

6. Many schools do not approve of male students        when they are at school. (wear)

-许多学校不允许男学生在校期间留长发。

Answer 1

6. wearing long hair approve of后可接动名词的复合结构作宾语。注意hair表一般概念的头发时，是不可数名词；若指几根特殊的头发时，可用复数形式。