PASSIVE VOICE
http://www.ego4u.com/en/cram-up/grammar/passive
http://www.englisch-hilfen.de/en/exercises_list/passiv.htm
http://www.ego4u.com/en/cram-up/grammar/passive/exercises?present-progressive
http://www.saberingles.com.ar/curso/lesson24/06.html
http://wwwedu.ge.ch/cptic/prospective/projets/anglais/exercises/passive1.htm
http://www.learnenglishfeelgood.com/esl-passive-voice-exercise2.html
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