For teachers and tutors, the PDF version facilitates the "flipped classroom" model. Students can be assigned reading or vocabulary exercises from the PDF as homework, allowing class time to be dedicated solely to speaking and active practice. The portability of the file means students have zero excuses for leaving their books at home.

A: The answer key is not in the Student’s PDF; it is in the Teacher’s Book. You can find official answer keys on the Macmillan Education Teacher’s Resource Hub (requires a teacher account).