1. I __________ run 1kilometer in four minutes. A. must B. could C. can D. may 2. He________swim across the river when he was young. A. must B. could C. can D. might 3. Luckily, she_________escape from the burning building. A. can B. could C. was able to D. must 4. I_____________ leave the hospital in a few weeks, I hope. A. could B. was able to C. have been able to D. will be able to 5. I ____________ swim since I was 5 years old. A. could B. was able to C. have been able to D. will be able to 6. ________I see the doctor, please? A. May B. Can C. Could D. All are correct 7. You_________ cut down on the amount of red meat you eat. It is good for you. A. should B. had better C. ought to D. All are correct 8. You_______ follow the rules when you are at work. A. have to B. may C. must D. A and C 9. Last year, when I was ill, I_______ take these pills twice a day for two weeks. A. must B. had to C. have to D. has to 10. You___________ wear uniform when you go to school because it’s the summer semester. A. needn’t B. don’t have to C. don’t need to D. All are correct 11. You have been studying for 2 hours. You_________ be tired. A. must B. can C. could D. able to 12. She looks too young and inexperienced. She__________ be the doctor we are looking for. A. mustn’t B. can’t C. may D. shouldn’t 13. The ground is wet. It__________________ last night. A. should have rained B. could have rained C. must have rained D. may have rained 14. Why did you leave the door open last night? You___________ it before you went to bed. A. should have rained B. could have rained C. must have rained D. may have rained