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题型：单选题 题类：模拟题 难易度：普通
Bicycle sharing is{#blank#}1{#/blank#} convenient{#blank#}2{#/blank#} it becomes more and more popular．
Tom was {#blank#}1{#/blank#} excited {#blank#}2{#/blank#} he had already {#blank#}3{#/blank#} his homework {#blank#}4{#/blank#}.
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