ONE-ONES EXERCISES

http://www.better-english.com/grammar/one.htm
http://www.tolearnenglish.com/exercises/exercise-english-2/exercise-english-58489.php
http://oudwww.bonhoeffer.nl/engels/3eklas/unit7/3un7-g40.htm
http://learnenglish.britishcouncil.org/ar/english-grammar/pronouns/one-and-ones