Form 8a. Passive voice

For practicing: https://www.ego4u.com/en/cram-up/grammar/passive/exercises?simple-present; http://www.englisch-hilfen.de/en/exercises/active_passive/sentences_gaps.htm; http://www.perfect-english-grammar.com/passive-exercise-5.html; https://learnenglish.britishcouncil.org/en/english-grammar/verbs/active-and-passive-voic; http://www.learnenglishfeelgood.com/esl-passive-voice-exercise2.html.