https://englishinn.ru/gerund-gerundiy-uprazhneniya-dlya-prodolzhayushhih-uroven-2.html

https://interneturok.ru/subject/english/class/10-11

https://englishweb.ru/grammar/gerund-exercise.html

 https://games4esl.com/quiz/plural-nouns-quiz/

https://www.learnenglishfeelgood.com/nouns-plural-form1.html