将下列句子变为被动语态。
1. They will publish his new book next month.
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2. They won't hold the school sports meeting until next month.
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3. Ba Jin wrote these books in the 1960s.
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4. They will rebuild the old bridge next year.
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5. Will your school allow you to watch the Beijing Olympic Games?
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6. No one watered the flowers yesterday.
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7. Someone gave a talk on Chinese history in the school hall last week.
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8. I'm sure they will choose you to be the monitor some day.
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