What is the most popular gift for Mother's Day?

词汇:

celebrate v.庆祝, 祝贺, 表扬, 赞美, 举行

on average平均起来

retail n.零售adj.零售的v.零售, 转述adv.以零售方式

f eration n.同盟, 联邦, 联合, 联盟