听对话，选择恰当的单词把对话补充完整。
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library pictures classroom
twenty maps
thirty
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A: Do you have a big and beautiful {#blank#}1{#/blank#}?
B: Yes, I do. It is next to the {#blank#}2{#/blank#}.
A: Are there any {#blank#}3{#/blank#} on the wall?
B: No, there aren't. There are some {#blank#}4{#/blank#}.
A: How many students are there in your class?
B: There are {#blank#}5{#/blank#} boys and {#blank#}6{#/blank#} girls.
A: That's great!
