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题型:单选题 题类:常考题 难易度:普通
I practice {#blank#}1{#/blank#} the violin every day so that I can perform {#blank#}2{#/blank#} in the competition.
—A big lake.
We'll be able to travel to Mars {#blank#}1{#/blank#} {#blank#}2{#/blank#}.
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