http://www.learnenglish-online.com/grammar/readings/simplepastreading.html

jobs

https://agendaweb.org/vocabulary/people_jobs_personalities-exercises.html
https://learnenglishkids.britishcouncil.org/es/category/topics/jobs
http://learnenglishteens.britishcouncil.org/vocabulary/beginner-vocabulary/jobs
https://www.englisch-hilfen.de/en/exercises_list/work_occupation.htm
https://www.englishexercises.org/buscador/buscar.asp?nivel=any&age=0&contents=jobs#a

regular and irregular verbs

https://agendaweb.org/verbs/past_simple-exercises.html
https://www.englisch-hilfen.de/en/exercises_list/verbs.htm
https://www.perfect-english-grammar.com/irregular-verbs-exercise-1.html
https://www.englishexercises.org/makeagame/viewgame.asp?id=7798
https://www.test-english.com/grammar-points/a1/past-simple-regular-irregular/

to be simple past

https://agendaweb.org/verbs/to-be-past-exercises.html
https://www.englisch-hilfen.de/en/exercises/tenses/was_were.htm
https://www.ego4u.com/en/cram-up/grammar/simple-past
https://learnenglishkids.britishcouncil.org/grammar-practice/past-simple-verb-be