| 1. 难度：中等 | |
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(2018长春改编) Work hard and be patient, ________ your dream won't come true.
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| 2. 难度：中等 | |
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(2018保定竞秀区二模) Last night I stayed up too late, ________ I'm really sleepy now.
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| 3. 难度：困难 | |
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Help others, ________ you'll feel happier.
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| 4. 难度：中等 | |
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The factory is usually noisy, ________ it is pretty quiet today.
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| 5. 难度：中等 | |
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T________ Edison failed many times, he didn't give up and succeeded in the end.
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| 6. 难度：中等 | |
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The story isn't hard to understand, b________ there are no new words in it.
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| 7. 难度：中等 | |
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Some people won't realize the importance of their health u________ they lose it.
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| 8. 难度：中等 | |
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I really want to have a pet dog,_____ my mother disagrees. A. but B. and C. or D. so
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| 9. 难度：中等 | |
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Taxi Apps（打车软件）can help us travel around more easily. ___more and more people like using them. A.Or B.So C.And D.But
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| 10. 难度：中等 | |
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The sky is much bluer ________ we have taken action to protect the environment. A.because B.before C.until D.unless
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| 11. 难度：中等 | |
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I can lend my bike to you ___________ you promise to take good care of it. A. while B. if C. although D. unless
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| 12. 难度：困难 | |
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(2018青海改编) Learn more reading skills, ________ you'll be a good reader. A.and B.or C.but D.so
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| 13. 难度：中等 | |
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(2018百色改编) ________Wu Lan is still young, she can help her mother do some housework on weekends. A.After B.Until C.Though D.Unless
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| 14. 难度：中等 | |
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(2018襄阳改编) Be quick, ________ we'll fail to catch the school bus. A.and B.but C.or D.so
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| 15. 难度：中等 | |
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Jack has learned more about teamwork ________ he joined the soccer team. A.until B.since C.while D.though
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| 16. 难度：中等 | |
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(2018张家口桥西区一模) I have much homework to do today, ________ I cannot play football with you. A.or B.so C.and D.but
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| 17. 难度：中等 | |
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(2018保定莲池区二模) ________ it is very cold outside, we still do exercise every morning. A.Unless B.Until C.Although D.Because
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| 18. 难度：中等 | |
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(2018秦皇岛一模)Simon thinks the math question is difficult, ________ Lucy thinks it is easy. A.and B.or C.so D.but
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| 19. 难度：中等 | |
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(2018承德双桥区一模) A tourist will easily lose his way in a new city ________ he has a map or a guide. A.if B.because C.unless D.when
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| 20. 难度：中等 | |
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(2018邢台二模) I bought my friend a birthday present, ________ he liked it very much. A.or B.but C.and D.so
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| 21. 难度：中等 | |
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(2018邢台二模) You'd better bring a sweater ________ it is cold there in the evening. A.unless B.because C.when D.if
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| 22. 难度：中等 | |
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My mother was cooking in the kitchen ________ I came home. A.after B.while C.when D.until
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| 23. 难度：中等 | |
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Tommy, don't make a noise! ________ you have any questions, please put up your hands. A.Before B.If C.Though D.Until
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| 24. 难度：简单 | |
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Put on your coat, you will catch a cold. A.and B.but C.or D.so
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| 25. 难度：中等 | |
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I am quite busy. I don't know ________ I'm free or not tonight. A.if B.unless C.whether D.when
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| 26. 难度：中等 | |
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Jane, please turn off the lights ________ you leave the classroom. A.after B.before C.until D.unless
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| 27. 难度：中等 | |
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________ he has said sorry to you, please give him another chance. A.When B.Since C.Before D.Until
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| 28. 难度：中等 | |
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Tom is only two years old, ________ he shouldn't be left alone. A.and B.so C.but D.for
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| 29. 难度：简单 | |
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________ we finished drinking tea, we all sat on the grass. A.When B.After C.Before D.If
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| 30. 难度：中等 | |
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________ you make a promise, you should try to keep it. Or you'll lose others' trust. A.Unless B.Because C.Before D.Once
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| 31. 难度：中等 | |
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Don't cut in line ________ you're waiting for the bus or shopping. A.while B.unless C.once D.though
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