Skysmart Solutions — offers checked answers by teachers for Buneev textbooks.
For the by Buneev, Buneeva, Komissarova, and Tekucheva, "Spishi.ru" (and similar sites) typically provides solutions for topics like Participles (Причастия) and Adverbial Participles (Деепричастия). spishi ru russkii iazyk 7klass buneevy
ГДЗ Бунеев по классам и предметам - Skysmart: Решения Skysmart Solutions — offers checked answers by teachers