IV. Complete the following sentences. Use affirmative or negative of "ought to". 1. You ______study harder to get better marks. 2. They _______ be angry. It isn't good for their health. 3. A: It's so cold. B: You ______put on your thick coat before going out. 4. If somebody steals your wallet, you ________tell the police. 5. You ______buy that meat. It doesn't look fresh enough. 6. She _______stay up too late at night as she may feel tired in the morning. 7. Candidates ______wear shorts and a T-shirt to a job interview. 8. It's raining. If you don't want your dress to get wet, you ________________ take an umbrella. 9. You are driving too fast. You _______slow down. 10. Lisa _______treat her younger sister badly. It makes her very unhappy.