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Math is     useful subject. You must study harder, I think.A. a B. an C. the D. /

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a, an    a, an    an, an    an, a  
is a    is an    are a    are an  
best; most    better; most    better; more    best; more  
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useful   interesting   relaxing   fun  
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too; too    either; either    too; either    either; too  
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a, an    an, a    a, a    an, an  

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