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    This is Mr. Smith. His first n{#blank#}1{#/blank#}is David. He has two sons. Bob is t{#blank#}2{#/blank#}. Jack is twelve, too. They're in the same school. Bob is i{#blank#}3{#/blank#}Class Three. Jack is in Class Four. Their m{#blank#}4{#/blank#}is a teacher of English. She l{#blank#}5{#/blank#}her pupils very much.

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A: Excuse {#blank#}1{#/blank#}, Where is {#blank#}2{#/blank#} eraser?

B: Look, it's {#blank#}3{#/blank#}, {#blank#}4{#/blank#} the floor.

A: Thank you.