1. Today’s crossword puzzle will definitely exercise your [ grey ] matter!
2. What the government intends to do to solve the problem is still a [ grey ] area.
3. Although aging populations are often associated with poor economic growth, the [ grey ] economy provides business opportunities not only in care provision, but also in recreational activities catering for the elderly.
http://www.examenglish.com/cpe/cpe_use_of_english_part3.htm
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