Question

4-you MUSTN'T/DON'T HAVE TO make your bed. You can choose.

5- you HAVE TO / DON'T HAVE TO look after the key to your room

6-you MUST/MUSTN'Tbe late,Classes start at 8.30 am.​

Answer 1

4) don’t have to
5) have to
6) mustn’t

Espero que te sirva, me ayudas mucho con la coronita :)