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 Teacher's Edition features complete teaching instructions, optional activities, audio scripts, language summaries, and Student's Book and Workbook answer keys. The Complete Assessment Program comes on a USB and provides quizzes, mid-term and final tests in printable PDF and Microsoft Word formats. It also includes the complete Placement Test for Interchange and Passages