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

—We need a new leader for our Helping Hands Club，but I don’t know_______.—Why not Mary? She is always willing to help others.

He had to put his shoes lightly,     he?

----“It’s too cold. Would you mind_________ the window?”  ----“_____. But don’t do it now.”

--- He hardly spent any time on his subjects, ____________ ?--- _______________, so he does badly in his lessons.