1. Jessica hasn’t made up her mind about where to go to school. She __________ attend Duke University. She just doesn’t know yet., A. mustn’t , B. may not, C. needn’t, D. can’t, 2. This box isn’t as heavy as it looks. You ________ help me with it. Thanks anyway for offering to help., A. must , B. mustn’t, C. might, D. needn’t, 3. You ________ play loud music at night. The neighbours will call the police., A. mustn’t , B. needn’t, C. might not, D. couldn’t, 4. You __________ stand up. There are a lot of seats available on the bus., A. couldn’t , B. mustn’t, C. needn’t, D. might not, 5. People who use public parks __________ clean up after themselves., A. must , B. may, C. ought, D. might, 6. This library book is overdue. I _________ better return it today., A. need , B. must, C. might, D. had, 7. Our company provides free advice on the use of our products. You _________ pay us. , A. must, B. have to, C. needn’t, D. mustn’t, 8. We_______ open the lion’s cage. It is contrary to Zoo regulations. , A. must, B. mustn’t, C. needn’t, D. should, 9. I arrive on time, so please start dinner without me. , A. could, B. may, C. may not, D. should, 10. Young people ______ obey their parents.  , A. must, B. will, C. may, D. ought to.

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