Do a few exercises to revise the articles: THE / A / AN

Do a few exercises on the articles: THE / A / AN

https://agendaweb.org/exercises/grammar/articles-definite-indefinite

https://www.englishpage.com/articles/articles_7.htm

http://www.focus.olsztyn.pl/en-exercises-on-articles.html#.WnnkPKhl_IU

https://www.learnenglishfeelgood.com/mixed-english-articles3.html

http://www.english-grammar.at/online_exercises/articles/art009.htm