Children are taught to spend their pocket money responsibly.

responsibly 是形容词 responsible（负责任的）加上后缀 -ly 构成的副词形式。responsible 来自动词 respond（回应），字面意思是"能够回应的"，引申为"负责任的"。 responsibly 作为副词，表示"负责任地"，描述如何执行某个动作。