－You aren’t a stranger, are you?－       , don’t you remember        me at the school gate ten minutes ago?

— Tom’s never done extra work for his class, _______he?—_______. He is the laziest boy in his class.

---You never have sweet snacks, do you?---________. Though I know they’re bad for our health.

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