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    Sheep feed ______ grass.
    [     ]
    A. in
    B. on
    C. at
    D. out

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    We have math ____________ Monday.

    A.in                        B.on                        C.at

     

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    Please call me ___ 2137718.

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

     

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    What's this _____ English?
    [     ]

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

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    Please call him _____ 2589867.    
    [     ]
    A. in        
    B. on        
    C. at        
    D. of

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