Passive Voice

Organize the question
http://www.iesneiravilas.org/departamentos/ingles/study/passivevoice/wu_america.htm

Passive voice or active voice?
http://www.iesneiravilas.org/departamentos/ingles/study/passivevoice/passive_active1.htm

Write the right form of the verb
http://www.iesneiravilas.org/departamentos/ingles/study/passivevoice/twin_towers.htm
http://www.iesneiravilas.org/departamentos/ingles/study/passivevoice/cherries.htm