把下列句子变为被动语态。
1. She is teaching the boy.→
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2. Now he is watering the trees.→
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3. One of the best students is writing the report about the environment.→
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4. We are painting our classroom now.→
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5. Some factories are polluting the rivers.→
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6. People are not hunting wild animals.→
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7. Look! Their aunt is taking care of the children.→
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8. Is the doctor examining the patient now? →
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9. Are the workers building the library? →
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10. Why are you cleaning the house? →
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