Answer:
1. Must
2. Musn't
3. Must
4. Musn't
5. Must
Step-by-step explanation:
All musts are beneficial to you and your wellbeing.
All musn'ts are hazardous to you and your wellbeing.
1. You must tidy up your room.
2. You mustn't smoke.
3. You must (do your) homework.
4. You mustn’t play with fire.
5. You must be on time.
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