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题型:翻译 题类:常考题 难易度:普通
How can we {#blank#}1{#/blank#} when we are walking on the street?
Students {#blank#}1{#/blank#} keep the classrooms {#blank#}2{#/blank#} and clean.
Jack is {#blank#}1{#/blank#} {#blank#}2{#/blank#}his father in many ways.
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