Cambridge University Press, 2014. — 253 p.
2nd edition. The interleaved Teacher's Edition contains practical, step-by-step teaching notes for each page of the Student's Book. It also offers:
Language notes that not only provide an overview of the language presented in each unit but also give useful information, drawn from the Corpus, on the frequency of grammatical forms, words, and expressions
a wide variety of extra activities geared to both small and large classes
unit-by-unit Language summaries that include the unit vocabulary and expressions
audio scripts for recorded material from the Student's Book
the Workbook answer key