根据要求完成句子。
1.Twenty faces we can see.(就划线部分提问)
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2.There are many students doing homework.(改为一般疑问句)
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3.There is one on the floor.(改为否定句)
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4.please , the, class, begins, out, crayons, give, painting, the (, .)(连词成句)
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5.There are twenty–one crayons.(英译汉)
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