These books often included "keys" for self-checking directly within the textbook or the accompanying Reader.
Happy English - Счастливый Английский Кауфман gotovye domashnie zadanija k uchebniku happy english
Focused on authentic British English with a collaborative Russian-British approach. These books often included "keys" for self-checking directly
A legacy series published by (and later Drofa) by authors T. B. Klementieva and B. Monk (or Jill Shannon). gotovye domashnie zadanija k uchebniku happy english
Uses a continuous adventure storyline (e.g., about a boy named Misha and his travels) to teach grammar and vocabulary.