The answer key is a time-saving tool, not a crutch. Use it to:
Grammar and Beyond Essentials Level 3 is part of a series of grammar textbooks published by Cambridge University Press. The book is designed for students who have already learned the basics of English grammar and are looking to improve their skills and knowledge. Grammar And Beyond Essentials Level 3 Answer Key
Most comprehensive answer keys are found in the back of the Teacher’s Manual. The answer key is a time-saving tool, not a crutch