th confidence. Vocabulary explanations and practice for upper-intermediate level (B2) learners of English. Perfect for both self-study and classroom activities. Quickly expand your vocabulary with over 100 units of easy to understand explanations and practice exercises. Be confident about what you are learning, thanks to Cambridge research into how English is really spoken and written, and get better at studying by yourself, with units on learning vocabulary, personalised practice and an easy to use answer key.