Complete the sentences, using must, mustn't, have to or will have to 1. julie, trying to train her dog: you must sit when i tell you to! 2. the teacher who is invigilating stephen's exam: you try to talk to each other during the exam. 3. the doctor to a nurse, about a patient with a bad heart: he stay in bed for several weeks, and talk too much. 4. mr. wilson phones his wife at 6 pm: i'm afraid i'm going to be late — i finish some letters. 5. the immigration officer notices that a traveller hasn't signed his new passport: you sign it as soon as you get it. 6. mr. wilson explains why he is taking a pill: i take these pills for my blood pressure. 7. mrs. wilson is offering more cake to a guest at a tea party: you have some more cake. 8. stephen has hurt his knee playing football: the doctor says i play for three weeks.