题目内容

Your ball is _____ the floor.

A. in
B. at
C. on
D. of

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There ______ two knives in the pencil-box.

A. are
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These ______ desks are new.

A. student's
B. students'
C. the students
D. students's

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A. a,a
B. a, the
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A. Tom
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