People who eat a balanced diet should be healthier than those who only eat biscuits and hamburgers,              ______?

--Laura didn’t join in their dancing last night , did she ?---________________, because she fell off her bike and hurt her legs 

— Anna’s father seldom has breakfast at home,          ?—          . He has it on his way to work．

——Susan has never been to Beijing, ________?——________, she went there with her parents last month.

—Mr Wang’s never been to Canada, has he?— ______. He went there on business last week.