按要求改写句子。
1. The children are playing. They are happy. (合二为一)
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2. I see some people. They are running quickly. (合二为一)
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3. This is a bus. (改为复数形式的句子)
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4. This is a man and that is a woman. (改为复数形式的句子)
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5. Flying a kite is easy for Jenny. (改为反义句)
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