Change the following sentences into passive voice :
1. We have made an appointment to see the manager ______________________________________________________________________________
2. Someone ought to do something about it
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3. Someone threw a lighted cigarette into the wastepaper basket.
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4. They are going to build a new bridge in this area.
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5. The police are questioning him at their headquarters.
______________________________________________________________________________
6. They grow rice in tropical countries.
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7. We have to tell Mary about our change in plans.
______________________________________________________________________________
8. We should save natural resources for the future generation.
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9. They built the Eiffel Tower in 1889.
______________________________________________________________________________
10. My father taught me how to use the computer.
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11. The students are planting trees in the schoolyard at the moment.
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12. Peter sent me a lovely present on my birthday
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