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1. The boy ________ (cast) a stone against the window. 2. We should always avoid ________ (embarrass) the students. 3. She needs the work ________ (do) before tomorrow. 4. She would have come if you ________ (invite) her. 5. She enters, ________ (accompany) by her mother. 6. I should never forget ________ (see) the Swiss Alps for the first time. 7. John's ________ (go) there won't make too much difference. 8. Tell your friends ________ (come) again, the sooner the better. 9. A special message ________ (broadcast) last night. 10. The workers demonstrated for better ________ (work) conditions. 11. Air pollution is a major factor ________ (contribute) to respiratory disease. 12. It's very ________ (discourage) that every time I try to ride a bicycle I fall off. 13. I can hardly ________ (realize) that New Year is here. 14. Recent changers in the tax law ________ (set out) in this book. 15. I went closer, and he ________ (put) his arms around me. 16. He ________ (lie) till evening without moving, without even thinking. 17. We ________ (live) here in New York for twenty years. 18. The two steps ________ (cannot, confuse). 19. A smile often ________ (denote) pleasure. 20. The powder ________ (absorb) more heat and thus speeds up the melting. 21. I used ________ (swim) in this river. 22. The horse-power ________ (need) to propel (推进) the ship must be calculated. 23. While he was in prison he was not allowed ________ (communicate) with his family. 24. A week ago I had a hundred dollars ________ (save). 25. Every word ________ (hear) in all parts of the hall. 26. The last time we ________ (meet) was in London. 27. I began ________ (make) preparations for this journey. 28. Whether he works or not, I don't think he ________ (pass) the examination. 29. The more I think about it, the ________ (little) I like it. 30. I am still hopeful that he ________ (come). 参考答案： 1. cast 2. embarrassing 3. done 4. had invited 5. accompanied 6. seeing 7. going 8. to come 9. was broadcast 10. working 11. contributing 12. discouraging 13. realize 14. are set out 15. put 16. lay 17. have lived 18. cannot be confused 19. denotes 20. absorbs 21. to swim 22. needed 23. to communicate 24. saved 25. is/was heard 26. met 27. to make 28. will pass 29. less 30. will come |
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