Bài 1: Điền động từ khuyết thiếu “must” hoặc ‘mustn’t” vào chỗ trống để hoàn thành các câu sau. 1. I __________do the laundry every2 days 2. You __________ stay out too late. 3. You ___________ break the class’s rule 4. My mother doesn’t want me to arrive home late, so I __________ leave now. 5. Those boys ___________ finish their homework before going out. 6. Jim ___________ finish his essay today because he’s very busy tomorrow. 7. Passengers___________ use phones on the plane. 8. You __________ be late for school tomorrow. 9. Children _______________ be accompanied by an adult when visiting this dangerous place. 10. I ____________ be home before dinner. 11. Students_________ talk during the exam. 12. You ____________ cheat in a test. 13. There _____________ be someone upstairs. I can hear the noise. 14. We _____________ give up on what we are doing. 15. You __________ let strangers enter the house while I’m not in.