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: Some students find the shift from story to formal grammar rules abrupt and use GDZ to verify their understanding of complex exercises. gdz po angliiskomu klass uchebnik happy english kaufman
: Can be slow-paced for advanced learners; some students find the reliance on a single narrative repetitive over multiple years. Happy English.ru 6 kl Uchebnik - Amazon.ca Angliyskiy yazyk