https://agendaweb.org/exercises/verbs/modals/mixed-test-1.htm
https://agendaweb.org/exercises/verbs/modals/mixed-test-2.htm
https://www.examenglish.com/KET/KET_reading_and_writing.html (Exercises 1-4)
WORK ON THE PAGE 3. https://es.slideshare.net/JuanGuillermoSepulve2/workbook-6
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