revision for test

1. https://www.englishclub.com/grammar/verb-tenses_past-continuous-quiz.htm
2. https://www.englisch-hilfen.de/en/exercises/tenses/simple_past_mix.htm
3. http://downloads.bbc.co.uk/worldservice/learningenglish/quiznet/pdfs/103_telling_the_time.pdf
4. https://www.tolearnenglish.com/exercises/exercise-english-2/exercise-english-10086.php