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1. I don't think you musn't eat so much chocolate. It's bad for your health. 2.Children must behave well when they're in class.
3. If you drive a car, you have to stop at marked crossings.
4. I think waiters must try to be pleasant with customers.
5. Some works have to wear hard hats because their jobs are considered dangerous.
6. If you feel sick, you must stay at home. It's better for you.
7. Police officers have to wear a uniform.
8. I have to do my homework. My teacher always checks if we have done the exercises.
9. I have to get my hair cut. I don't like it so long.
10. We must go home. My mother has told me to arrive at ten o'clock.
11. I must study hard. I want to pass the exam.
12. In Spain, children have to go to school until they're 16.
13.You don't have to phone every day, darling!
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