Bài tập 2: Chọn câu trả lời đúng 1. I’m not sure. I ___________ come a few minutes late. A. may B. must C. mustn’t D. needn’t 2. Bring your umbrella. It ___________ rain later today. A. must B. may C. mustn’t D. needn’t 3. “What are you doing this weekend?” “I haven’t decided yet. I ___________ go on a picnic with my family.” A. may B. may not C. must D. needn’t 4. “I didn’t have time for breakfast this morning.” “You ____________ be very hungry now.” A. might B. may C. mustn’t D. must 5. It’s quite urgent. You ___________ type the reports today. A. must B. might C. needn’t D. would 6. Don’t worry if you’re a minute or two late. We ___________ be exactly on time for the meeting. A. must B. mustn’t C. needn’t D. may 7. Jane’s glasses are on the desk, so she ___________ be here. A. must B. shall C. ought D. will 8. The gas tank is almost empty. We ______________ stop at the next service station. A. mustn’t B. might C. needn’t D. had better 9. A person ______________ eat in order to live. A. have to B. must C. should D. may 10. A person ____________ eat a balanced diet. A. should B. ought C. may D. must 11. I don’t have enough money to take the bus, so I ______________ walk home. A. should B. mustn’t C. have to D. needn’t 12. You ______________ eat these mushrooms. They are very poisonous. A. needn’t B. can’t C. mustn’t D. won’t 13. I can’t find my umbrella. I _____________ it in the restaurant last night. A. must have left B. had left C. left D. might leave 14. I had a test this morning. I didn’t do it well. I ______________ last night. A. should study B. must have studied C. should have studied D. must study 15. Tom goes to school very often, but he was absent yesterday. He ______________ ill. A. must be B. must have been C. might be D. might have been.