1. https://testedu.ru/test/english-language/11-klass/ispolzovanie-slov-so-such.html 2. https://www.elt-els.com/2017/11/so-such-multiple-choice-test.html 3. https://test-english.com/grammar-points/b1/so-such-such-a-so-much-so-many/ 4. http://www.esl-lounge.com/student/vocabulary/2v33-pre-intermediate-so-and-such-vocabulary-gap-fill-quiz.php