http://www.englisch-hilfen.de/en/exercises/tenses/simple_past_progressive2.htm
https://elt.oup.com/student/project3rdedition/level5/unit1/grammar/exercise1?cc=us&selLanguage=en
http://www.englishexercises.org/makeagame/viewgame.asp?id=734
http://www.5minuteenglish.com/mar10.htm
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