句型转换
1. Peter exercises for half an hour every day.（对划线部分提问）
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2. Mother spends about 30 minutes cooking dinner for us.（改为同义句）
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3. I sleep for more than 8 hours every night. (对划线部分提问)
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4. I think I need lots of energy every day. (改为否定句)
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5. What about a kilo of meat? (用two替换a改成复数句)
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