Oxford Word Skills improves students’ vocabulary and vocabulary-learning skills. Short, clear presentations and lots of opportunity for practice give students the confidence to use new vocabulary. 100 units at each level mean they cover a huge range of topics and everyday situations. The Oxford Advanced Learner’s Dictionary app, or OALD app, provides pronunciation and more information about the meaning and usage of words.
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http://usafiles.net/2iMG/Oxford-Word-Skills-New-Edition-Elementary.pdf