—You won’t pass the exam ________ you don’t work hard. —OK, I’ll do my best.
_______ he brought us!
There are many trees on_______ side of the street, and_______ of the trees is still growing.
It's silly_______ you_______ other's homework.
Much more attention should_______ when we have exams.
-May I watch TV now, Mum? -No, you_______. You_______ do your homework first.A. don't; must B. don't; can't C: can't, must D. can't; can