按要求改写句子。
1. It's rainy. (否定句)
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2. This is a snowy day. (一般疑问句)
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3. It's hot today. (一般疑问句，并做否定回答)
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4. It's Tuesday today. (就划线部分提问)
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5. International Workers' Day is May first. (就划线部分提问)
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