Change these sentences into Passive Voice:
1. Ha has t finish the exercises in this book before 9 pm
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2. The principal may use this room this year
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3. You must clean the wall before you paint it
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4. People speak English in almost every corner of the world nowadays
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5. No one can do anything unless someone gives us more information
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6. It's high time someone told her to stop behaving like a child
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7. My mother sent us a lot of moon cakes
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8. My teacher gave me an interesting book
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9. You should pay your bill before you leave the hotel
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10. You mustn't touch this button while the experiment is in progress
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