Hundreds of words to learn and remember Collins Work on your Vocabulary – Intermediate (B1) is a new practice book that covers the key vocabulary needed by learners of English at Intermediate level (CEF level B1). This book is an essential resource for learners who want to improve their English vocabulary. Each of the 30 units presents vocabulary relating to a particular topic using clear language and examples. This is followed by practice exercises to ensure the learner will remember and be able to use what they have learnt with confidence in their written and spoken English.