按要求完成句子。
1. They are listening to the radio. (改为否定句)
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2. Are you walking in the park? (作肯定回答)
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3. the, having, girl, a, party, is, birthday (.) (连词成句)
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4. 我们正在野餐,这时下雨了。(翻译成英语)
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5. She is talking to her friend. (对划线部分提问)
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