按要求变化下列各句:
1. She's standing near a tree. (一般疑问句)
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2. They are singing in the room. (对画线部分提问)
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3. There is a box under the desk. (复数)
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4. There isn't any milk in the bottle. (肯定句)
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5. Is your brother jumping? (否定回答)
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