按要求完成下列句子。
1. The children ________ ________ _________ in the park.(正在看书)
2. He's dancing in the classroom.(改为一般疑问句)
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3. park, you, to, can, the, take, him (?)(连词成句)
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4. Are these birds flying?(作否定回答)
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5. picture, green, is, his, the (?)(连词成句)
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