THERE IS / ARE

https://www.englisch-hilfen.de/en/exercises/various/there_is_there_are.htm

https://agendaweb.org/grammar/there_is_are-exercises.html

https://sites.google.com/site/easygrammar4kids/to-be-present/there-is-there-are

http://www.anglomaniacy.pl/verbs-there.htm