按要求完成句子。
1.Walking is exercise. (改为否定句)
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2.I exercisefiftyminutes a week. (对划线部分提问)
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3.Running is exercise. (改为一般疑问句)
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4.I play sportstwice a week. (对划线部分提问)
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5.school, I, home, after, walk,(.)(连词成句)
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