Exercise 3: Choose the best answer (A, B, C or D) to complete the following sentences. 1. The man was found unconscious at the foot of the cliff. He ________ have fallen 200 meters. A. needn’t B. must C. should D. mustn't 2 When the fog lifts, we ________ where we are. A. could see B. will be able to see C. must have seen D. are seeing 3. The swimmer was very tired, but he ________ the shore before he collapsed. A. was able to reach B. can reach C. could reach D. has reached 4. If a letter comes for me, ________ you please forward it to this address. A. shall B. could C. must D. should 5. I don't believe it. It ________ be true. A. can't B. mustn't C. shouldn't D. wouldn't 6. Laura, you and the kids just have dinner without waiting for me. I _____ work very hard today. A. can B. may C. should D. would 7. Leave early so that you ________ miss the bus. A. didn't B. won't C. shouldn't D. mustn't 8. He was very lucky when he fell off the ladder. He ________ himself. A. could have hurt B. should have hurt C. must have hurt D. will have hurt 9. Robert arrived without his book. He ________ it. A. might have lost B. should have lost C. would have lost D. will have lost 10. Twenty years ago, David ________ speak Arabic fluently. Now he's forgotten a lot. A. could B. might C. needed D. must 11. 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 12. 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 13. Yesterday everyone in the office ________ leave the building for a fire drill. I am glad it wasn't a real fire. A. may B. might C. must D. mustn't 14. You ________ play loud music at night. The neighbors will call the police. A. mustn't B. needn't C. might not D. couldn't 15. 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 16. People who use public parks ________ clean up after themselves. A. must B. may C. ought D. might 17. This library book is overdue. I ________ better return it today. A. need B. must C. might D. had 18. 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 19. Whatever ________ come, I will always be by your side. A. must B. may C. could D. need 20. " ________ you hand that book, please?" "Sure. Here it is." A. Could B. Should C. Must D. May Exercise 4: complete the sentences with modal verbs. 1. I left my bike here and now it's gone. Someone ________ have borrowed it. 2. "The door was open." "It ________ have been open. I had looked it myself and the key was in my pocket." 3. I want this letter typed, but you ________ do it today. Tomorrow you will do. 4. We ________ forget to shut the gates. 5. If you go to a dentist with a private practice, you ________ pay him quite a lot of money. 6. You ________ talk to other candidates during the exam. 7. "Have you seen John?" "No. But he ________ be studying in the library". 8. As I won't be at home tonight, I ________ do my homework during my lunch break. 9. Passengers ________ smoke until the signs have been switched off. 10. There are a lot of tickets left, so you ________ pay for the tickets in advance. 11. I ________ have worn my best suit to the party yesterday; everyone else was very casually dressed. 12. "What are you doing this weekend?" "I haven’t decided yet. I ________ go on a picnic with my family." 13. Can you repair my bicycle? -Oh, yes, I ________ do it now. 14. It's a secret. You ________ let anyone know about it. 15. I'm not sure. I ________ come a few minutes late. 16. Secondary school students nowadays ________ wear uniform. 17. I had read the book last night before I went to bed. 1 never took it out of this room. It ________be lying around here somewhere. Where ________ it be? 18. When you have a small child in the house, you ________ leave small objects lying around. Such objects ________ be swallowed, causing serious injury or even death. 19. You ________ take your umbrella along with you today. It ________ rain later on this afternoon. 20. I ________ be at the meeting by 10 pm I will probably ________ take a taxi if I want to be on time.