I, change these sentences into pasive form:
1, People have celebrated Teacher"s Day since 1980
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2, We always keep our school bright and green.
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3, Someone has just opened thí box.
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4, Lan took her mother to the hospital.
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II, Change these sentences into active form:
1, these exercises will be finished soon.
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2, This ball was found in the garden.
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3, this letter is going to be sent now.
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4, Are a lot of cars produced in Japan?
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