1. We must do something to stop ________ from killing sheep. 2. Mr. Lin was in the ________ at that time. 3. Their father is an ________ , not a doctor. 4. It’s very cold outside, so wear a heavy ________ . Ⅱ. 根据句意，用括号内所给单词的适当形式填空。
1. Sally was ________sleep in class because she only slept three hours the night before. 2. Jane heard strange ________noise outside her house that night. 3. There is a cat ________climb the tree. 4. It’s not ________simple a question of money. 5. Look Cindy is having fun ________read the storybook. 6. Maria saw something ________run past her, but she didn’t know what it was. Ⅲ. 根据语境，从括号内选出恰当的单词填空。
1. You ________can / must be tired after working for a long time without a rest. 2. Who is the woman over there Is she Mrs. Smith It ________may / can’t be her. She is much taller. 3. Where’s Zhang Lei I’m not sure. He ________could / need be in the zoo. 4. What will the weather be like tomorrow It ________must / might be windy or rainy. I’m not sure. 5. Alice ________must / can’t be working now, because the light in her room is still on. 6. The volleyball ________must / could be Jim’s or Jack’s. They both like playing volleyball. 7. I can’t find my pen at school. It ________could / can’t be at home. 8. Don’t play on the street. You ________could / mustn’t be hurt by cars. 9. Helen ________must / might pass the exam, but I’m not sure. 10. Jenny ________can’t / must be at home. She has gone to New York. 答案 Ⅰ. 1. wolves 2. laboratory 3. policeman 4. coat Ⅱ. 1. sleepy / asleep 2. noises 3. climbing 4. simply 5. reading 6. running Ⅲ. 1. must 2. can’t 3. could 4. might 5. must 6. could 7. could 8. could 9. might 10. can’t 3