Ex. 1. Fill in must, mustn’t, have to, don’t have to или doesn’t have to.
1. You ......... respect your parents.2. This party is free. You ......... buy any tickets.3. This is the last bus for Paris and we ......... miss it.4. You ........ be on time for the exam.5. We’re going to the restaurant, so our mother ... cook tonight.6. You ....... forget to turn off the light before you leave.7. Boys and girls, you ……. hand in your essays by Thursday.8. Tom …….. take a bus because his dad drives him to school every morning.9. You ........ tell me lies. It’s just awful.10. You ........ smoke on board the plane.