根据要求完成句子。
1. the / Wall / the / is / longest / Great / wall / the / world / in (.) (连词成句)
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2. I am going to visit Beijing in summer. (对划线部分提问)
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3. I know the Great Wall is in Beijing. (改为否定句)
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4. Harbin is in the north of China. (对划线部分提问)
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5. Beijing is the capital of China. (改为一般疑问句)
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