wh- words: WHAT, WHEN, WHERE, WHO

http://www.agendaweb.org/exercises/grammar/questions/what-where-when-who

http://www.agendaweb.org/exercises/grammar/questions/wh-questions

http://www.bradleys-english-school.com/online/MultipleChoice/whquestion.html


http://www.grammar.cl/Games/Question_Words.htm


http://digitalcampus.free.fr/Level1/Unit12/SubUnit122/WhQuestAnsw02.jmt.htm


http://www.focus.olsztyn.pl/en-wh-questions-exercises.html#.Vx5cffmLTIU

http://first-english.org/english_learning/english_beginners/questions_exercises/01_who_und_what_exercises.htm

http://www.learnenglishfeelgood.com/esl-who-when-where-what1.html

http://perso.ya.com/mjandres/archivos/whq1.htm

http://speakspeak.com/english-grammar-exercises/elementary/exercise-interrogative-pronouns