Answer:
1) Won't , I won't have a party.
2) should , The traffic isn't heavy. We should be there in an hour.
3) may , She may be a friend of Richard's.
4) must/mustn't , I must study today.
5) ought to , I ought to help you
6) don't , You don't need to get up early.
7) Can , Can i ask a question?
8) Cant/Mustn't , You mustn't use your phone in class , You cant go to the restaurant without a tie.
hope this helps!
