This has to be one of the sloppiest excuses for a language text that has ever made it into print. In exercise after exercise, you are asked to use words that are not provided in the vocabulary and for which the only option is to look up the answer in the key in the back. The trouble is, some of the words in the answer key aren't in the glossary either, so even if you can memorize a sentence you are still left wondering what the individual words mean and how and when they are used. Has nobody at Routledge ever heard of proofreading? This is such a shoddy piece of work that I would seriously consider giving it zero stars if that were an allowed option.