----- Nội dung dịch tự động từ ảnh ----- Exercise 3: Choose the correct answer (mustn't or needn't) 1. Mary 2. You 3. You 4. Students 5. You 6. You 7. It's a secret. You 8. You 9. You really 10. You go to bed early because tomorrow is her day off. smoke on the bus. It's forbidden. do it now; you can finish it later. use their mobile phones during the test. buy any beef. There is plenty of it in the fridge. bring an umbrella. I can lend you one. tell anybody. do the washing up as we have a dishwasher. be late again. drink at all if you plan to drive.