Interchange Fourth Edition is a four-level series for adult and young-adult learners of American English from the beginning to the high-intermediate level. Student's Book B, Level 3 builds on the foundations established in Level 2 for accurate and fluent communication, extending grammatical, lexical, and functional skills. Student's Book B, Level 3 contains units 9-16, the second half of the full Student's Book, progress checks, additional Interchange...