9. Are the workers building the library? →

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8. Is the doctor examining the patient now? →

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7. Look! Their aunt is taking care of the children.→

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6. People are not hunting wild animals.→

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5. Some factories are polluting the rivers.→

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4. We are painting our classroom now.→

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3. One of the best students is writing the report about the environment.→

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2. Now he is watering the trees.→

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1. She is teaching the boy.→

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6.　　　 似乎飞机在空中解体了。(break up)