Вставьте в пропуски must или mustn't
1.He cheat in examinations.
2.People see a dentist from time to time.
3.He brush his teeth twice a day.
4.People eat more fruit and vegetables .
5. Because he is ill, He stay in bed.
6. You practice any kind of sport.
1. mustn't
2. must
3. must
4. must
5. must
6. must