Read and choose must or mustn't.

1. The coach said you _______ practice if you want to get better at football.
2. You _______ forget to do your homework for tomorrow.
3. Your friends told you that you _______ walk alone at night.
4. In the science class, you _______ wear safety glasses.
5. To keep your room clean, you _______ put your toys away.
6. You _______ use your phone during class.

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