句型转换。
【小题1】I exercise fifty minutes a week. (对划线部分提问)
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【小题2】Running is exercise. (改为一般疑问句)
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【小题3】Walking is exercise. (改为否定句)
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【小题4】I play sports twice a week. (对划线部分提问)
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【小题5】school, I, home, after, walk (.) (连词成句)
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