Change into the passive form: Bob took that book from the desk

* Change into the passive form:
1. Bob took that book from the desk.
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2.They started a dancing class last week.
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3. Mr. Smith saw the accident
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4. The teacher returned our written work to us
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5. Beth has finished the report
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6. Somebody has taken my briefcase
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7. She has finished the report at noon
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8. She saw a strange object in the garden last night.