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Teach with confidence, using the world's favorite English course.
Interchange is a four-level, American English course that has been used by over 50 million students worldwide. This Intro Level Full Contact B includes the second half of the Student's Book, Workbook, video activity sheets, and online self-study. It has units 9-16, four progress checks, and a Grammar Plus section to ensure that students receive all of the practice they need. Inside each book is a single-use code for the online self-study material. This gives access to videos and hundreds of automatically graded exercises, and works on PCs and Macs.