Read the sentences and choose the correct options

1. You
   [must|mustn't] touch this animal. It is very dangerous.
2. You
   [must|mustn't] be polite with elderly people.
3. You
   [must|mustn't] brush your teeth twice a day.
4. You
   [must|mustn't] tidy your room at least once a week.
5. You
   [must|mustn't] walk alone late in the evening.
6. You
   [must|mustn't] drink unfiltered water.
7. You
   [must|mustn't] wash all fruits before eating them.