There is / There are

https://www.tolearnenglish.com/exercises/exercise-english-2/exercise-english-116171.php

https://www.myenglishpages.com/site_php_files/grammar-exercise-there-is-there-are.php

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

https://www.englisch-hilfen.de/en/exercises/various/there_is_there_are2.htm

http://www2.arnes.si/~oskplucija4/ces/thereisare.htm

https://elt.oup.com/student/englishfile/beginner/a_grammar/file06/grammar06_a01?cc=global&selLanguage=en

https://elt.oup.com/student/englishfile/beginner/a_grammar/file06/grammar06_a01?cc=global&selLanguage=en