13: Chọn Must hoặc Can điền vào chỗ trống .1.That's ridiculous- you……………………be joking. 2.That's the phone-who……………………​it be? 3. They haven't eaten for hours- they……………………​be starving. 4. I'm busy this morning, but I……………………​see you this afternoon if you like. 5. You……………………enter the country without a visa .6. They're two hours late- there……………………​be something wrong .7. She left two hours ago, so she……………………​have arrived by now. 8. My doctor says I……………………​lose some weight .9.……………………you smell something burning? Bài 14: Khoanh vào đáp án đúng. 1.We... .................... eat sweets in the classrooms. A. Can​​B. must​​C. mustn't​​D. don't have to 2. I... do my homework. My teacher said so. A. Can​​B. mustn't​​C. have to​​D. don't have to 3. This is the smoking room at this airport. You..................... smoke in this room .A. Must​​B. mustn't​​C.can​​​D. don't have to 4. I... ..................listen to the music I like. My parents like it too .A-Can't​​B.must​​C. mustn't​​D.don’t have ​to 5.I.................... watch TV late at night. My parents say I must go to bed early .A-Can't​​B.must​​C. can​​​D.don’t have ​to 6. We....................... be quiet A-Must​​B.mustn't​​C.has to​ ​D.don’t have to 7. You.............................. speak on the mobile phone on an aeroplane .A-Can​​​B.must​​C. mustn't​​D.don’t have ​to 8. You.................... put the rubbish into the bin A-Must​​B.mustn't​​C.has to​​D.don’t have to 9. You... ..............take photos in this museum.It’s against the ruler A.Must​​B. can​​​C. mustn't​​D. don't have to 10. You........................ make noise in this area .A. Can​​B. must​​D. mustn’t​​D. don’t have to ...