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题型:单选题 题类:常考题 难易度:普通
-- Fifty.
{#blank#}1{#/blank#} {#blank#}2{#/blank#} Bob{#blank#}3{#/blank#} ?
{#blank#}1{#/blank#} {#blank#}2{#/blank#}Tom usually {#blank#}3{#/blank#} on weekends?
— Once a month.
{#blank#}1{#/blank#} {#blank#}2{#/blank#} students are there in the classroom?
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