—I am going to spend my summer holiday in Hainan.—How lucky you are!  ____________  And don’t forget to e-mail me.

--- He is a very hard-working student．---________．As far as I know, he often burns the midnight oil．

—Have you been wasting time on computer games again? —       . I’ve been studying a lot and I need a break.

— I need some money, what should I do?— __________________ .

“Good luck with your new diet.”   “________.”