购物词汇：price, cheap, expensive — 英语填空题
题目
在服装店，Amy看到一条围巾标价 ¥15，一件外套标价 ¥180。她觉得围巾很便宜，外套太贵了。请根据句意和首字母提示补全单词：The scarf is only ¥15. It's very c______. The coat is ¥180. It's too e______. The p______ of the coat is much higher than the scarf's.