望马上解答.A:Mum,()ismy() .B:Your backpack?Is ()under the chair?A:No,it isn't.B:Is it on the sofa?A:Yes,it is.How ()()notebooks?B:Are ()in your backpack?A:No,they aren't.B:Yes.I remember.Ther are ()the ().A:On the table?On,yes,they're here.()you

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