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It remains doubtful________immediate measures could be taken to prevent underground water pollution...

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It has   It remains   They have   There remains  
remains to be done    is remained to do    remains to do    is remained to be done  
remains to solve    remains to be solved    remain to be solved    remain to solve  
remains to be done    is remained to do    remains to do    is remained to be done  
It has   They are   It remains   There remains  
It has    They have    It remains    There remains  
increases by the square of the original value  increases  remains the same  decreases  
there remains; answered    it remains; to be answered    there remains; to be answered    it remains; answered  
remains to do   is remained to do   remains to be done  is remained to be done  
is remained to do    remains to do    remains to be done    is remained to be done  
It has  They have  It remains  There remains  
there remains; answered    it remains; to be answered    there remains; to be answered    it remains; answered  
It has   They are   There remains   It remains  
It has    They have    It remains    There remains  
It has  They have  It remains  There remains  
there remains; answered    it remains; to be answered    there remains; to be answered    it remains; answered  
remains to do   is remained to do   remains to be done   is remained to be done  
It has    They have    It remains    There remains  
remains;bury  remainders;bury   remains;buried  remains;burying  
It has   They have   It remains   There remains  

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