http://www.learn4good.com/languages/evrd_grammar/article_ex3.php3
http://www.oup.com/elt/global/products/headway/upp_intermediate/b_vocabulary/unit01/
http://www.oup.com/elt/global/products/englishfile/upperint/b_vocabulary/bank01/nef_upperint_vocabulary01_01/
http://www.nonstopenglish.com/exercise.asp?exid=916
