1) Must the doctor help people? a) Yes, he must. b) No, he mustn't. c) Yes, she must. d) No, she mustn't. e) Yes, he mustn't. 2) Must the cosmonaut work with wild animals? a) Yes, he must. b) No, he mustn't. c) Yes, she must. d) No, he must. e) No, she mustn't. 3) Must the police officer wear uniform? a) Yes, they must. b) No, they mustn't. c) Yes, he must. d) No, he mustn't. 4) Must the teacher be polite? a) Yes, we must. b) Yes, we mustn't. c) Yes, he must. d) No, he mustn't. 5) Must the dentist run fast? a) Yes, she must. b) No, she must. c) Yes, he must. d) No, he mustn't. 6) Must the students be quiet in class? a) Yes, we must. b) Yes, they must. c) Yes, I must. 7) Must you and your classmates fight at school? a) No, they mustn't. b) No, we mustn't. c) No, he mustn't. d) No, I mustn't. 8) Must I feed my pets? a) Yes, I must. b) Yes, we must. c) Yes, you must. d) Yes, they must. 9) Must you brush your teeth every day? a) Yes, I must. b) Yes, you must. c) Yes, they must. d) Yes, she must.

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