https://en.islcollective.com/english-esl-video-lessons/grammar-practice/general-grammar-practice/simons-cat-passive-voice/612156
https://learnenglish.britishcouncil.org/skills/writing/upper-intermediate-b2/a-report-on-working-abroad
https://www.englisch-hilfen.de/en/exercises/active_passive/active_or_passive.htm
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