Language in Use．Beginner：Teacher's Book Language in Use．Beginner：Classroom Book Language in Use．Intermediate：Teacher's Book Language in Use．Pre-Intermediate：Teacher's Book Language in Use．Beginner：Self-study Workbook Mainline：Beginners A：Teacher's Book Language in Use．Pre-Intermediate：Classroom Book Language in Use．Upper-intermediate：Classroom Book Language in Use．Intermediate：Classroom book Language in Use．Pre-intermediate：Classroom book．B