ONE and ONES exercises

http://www.better-english.com/grammar/one.htm http://learnenglish.britishcouncil.org/es/english-grammar/pronouns/one-and-ones http://www.tolearnenglish.com/exercises/exercise-english-2/exercise-english-58489.php http://tx.english-ch.com/teacher/chris/level-a/the-usage-and-difference-between-one-and-ones/