These books often included "keys" for self-checking directly within the textbook or the accompanying Reader.
This is the most common version currently used in Russian schools. It is published by and authored by K. I. Kaufman and M. Y. Kaufman . Target Levels: Available for grades 2 through 11.
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.
Focused on authentic British English with a collaborative Russian-British approach. These books often included "keys" for self-checking directly
Happy English - Счастливый Английский Кауфман
Primarily known for Book 1 (Grades 5–6) and Book 2 (Grades 7–9). Kaufman
Solutions are often found in separate "Teacher's Books" or specific GDZ websites like Gitem.me . 2. Happy English (Classic/90s Edition)