Interchange is a four-level, American English course that has been used by over 50 million students worldwide. This Intro Level Student's Book includes 16 units, eight 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 online self-study material. This gives access to videos and hundreds of automatically graded exercises, and works on PCs and Macs.
9781009040419 INTERCHANGE 5ED INTRO SB WITH eBOOK
9781316622377 INTERCHANGE 5ED INTRO WB
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