You can find the answers (GDZ) for the 4th-grade Russian language textbook by Zelenina and Khokhlova on several popular educational portals. Online Answer Keys
If you tell me the or the specific topic you're working on (like "Nouns" or "Adjectives"), I can help you solve the problem right now.
💡 The textbook focuses on these core grammar areas: Sentences & Phrases: Structure and lexical meanings.