Complete the sentences with " mustn't " or " doesn't/ don't have to"
1. You.......................................tell lies.
2. Students.................................cheat during the rest.
3. A person...............................earn so much money to have a happy life.
4. You.....................................play with matches.
5. I've already finished all my homework, so I...................................study late tonight.
6. I................................forget to take may pens and pens and pencils with me.
7. You........................................introduce me her. I've already known her.
8. Dirves ...................................... drive very fast in the city center.
9.You.................................................. go to the concert if you don't want to.
10. In order to be a good student, you ........................................... be so untidy and lazy.