How often引导的特殊疑问句 — 英语词汇题
题目
Tom 记录了自己一周的健康习惯：周一、周二每天刷牙两次，周三到周日每天刷牙一次；他每两周去一次牙医诊所。根据记录回答问题，每空一词：
1. —How often does Tom brush his teeth in a week?
—He brushes his teeth ______ times a week.
2. —______ ______ does Tom go to the dentist's?
—Once every two weeks.