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I go to bed          about nine o’clock every night.
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 — Helen, your English is pretty good. How can I improve my English?—I think you can improve your English ______ reading more.
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People in the world know Confucius ______ a great thinker and educator.
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 _____ the help of the teacher,he became a good student.
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Our teacher told us that we must be strict         ourselves      our study.
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We should try our best to help the animals _______.
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dangerous