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          Sheep feed ______ grass.
          

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          A. in 
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          C. at 
          D. out 
          

			
          
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          We have math ____________ Monday.
          


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B.on                       
C.at
          


           
          

			
          
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          Please call me ___ 2137718.
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          What's this _____ English?
          

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          Please call him _____ 2589867.     
          

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