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If you are using An Integrated Approach to Intermediate Japanese and want an additional resource, An Integrated Approach to Intermediate Japanese Workbook is the logical conclusion. It is made to complement the textbook and provides practice for the grammar, vocabulary and kanji you learn, with the main focus being grammar. More specifically, this workbook provides plenty of practice drills for the grammar introduced in the main textbook. Lastly, every chapter ends with questions about the reading section introduced in the textbook. While some of them are directly related to the reading section's content, others are open questions that require you to state your personal opinion.