按要求改句子。
1. I usually go to the supermarket on foot. (对划线部分提问)   
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2. There are four hospitals in our city. (提问)
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3. Turn right at the traffic lights. (改为否定句)
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4. I’m on the bus now. (改为一般疑问句)
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5. There are many buses at the bus stop. (改为单数形式)
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