55. There are many children and adults whom behavior is generally unacceptable.
解析:有很多孩子以及成人的行为普遍不被接受。
孩子以及成年人的行为,behavior前面应该用表示所有格的whose,相当于one’s,在本句中是children and adults’ behavior,而不应该用宾格whom。正确的句子应该是There are many children and adults whose behavior is generally unacceptable.