Since Norman Whitney's books are standard international curricula, you can find the answers in the for the specific series you are using. Below are the most common resources:
If you made a mistake, look up why the correct answer is different. gdz po anglijskomu jazyku 8 klass norman whitney
This is a joint project with "Prosveshcheniye." Answers are typically found in the teacher guides on the official publisher website. gdz po anglijskomu jazyku 8 klass norman whitney
If you have a specific exercise you are stuck on, try searching for the exact text of the task. gdz po anglijskomu jazyku 8 klass norman whitney
Norman Whitney is the author of several popular series, most notably and " Team Up " (published by Oxford and used in many Russian schools). 📚 Where to find solutions