V.Change into passivoice.
1. Mary types letters in the office.
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2. His father will help you tomorrow.
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3. Science and technology have completely changed human life.
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4. Peter broke this bottle.
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5. They are learning English in the room.
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6. Nothing can change my mind.
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7.Has Tom finished the work?
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8. Did the teacher give some exercises?
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9. Have they changed the window of the laboratory?
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10. Is she going to write a poem?
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11. Is she making big cakes for the party?
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