Complete the following sentence with a (compound) word derived from the one(s) given in bracket.
When the mother saw her daughter suffering, she felt a sense of（ ）. (helpless)
【正确答案】：HELPLESSNESS
【题目解析】：
当妈妈看到女儿痛苦的时候，她感到无助，a sense of 后面跟名词，所以使用helplessness。