UPSC 2014 CDS I English Paper

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Directions for the following four items :
  Each of the following sentences has a blank space and four words given after the sentence. Select whichever word you consider most appropriate for the blank space and indicate your choice on the Answer Sheet.
[2014 CDS-I]
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Question : 117 of 120
 
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It is necessary to__________that adequate standards are maintained.
[2014 CDS-I]
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