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Interchange Fourth Edition is a four-level series for adult and young-adult learners of English from the beginning to the high-intermediate level. Interchange Fourth Edition Online Workbook A, Level 1 provides additional activities to reinforce what is presented in Student's Book A, Level 1. The Online Workbook includes activities which correspond to each Student's Book unit; instant feedback for hundreds of activities; clear, easy-to-follow navigation; additional audio practice; and simple tools to monitor progress.