Forms 4ab. Past Simple. Regular and irregular verbs

For practicing: https://learnenglishkids.britishcouncil.org/en/grammar-practice/past-simple-endings; http://www.grammarbank.com/simple-past-tense-regular-exercise.html; http://www.grammarbank.com/simple-past-irregular-verbs.html; http://www.really-learn-english.com/simple-past-exercises.html; http://www.english-room.com/pasttense_5a.htm; http://esldivlabs.vcc.ca/ELSA/Instructor_Web_Exercises/Grammar/Simple_Past_Tense_Review_Cloze.htm.