Stand Out Grammar Challenge workbooks provide supplemental exercises for students who desire even more contextualized grammar and vocabulary practice. Clear and concise grammar explanation boxes present English grammar structures in a straightforward manner. Practice exercises reinforce learning of key vocabulary and grammar. Five levels extend from low-beginning to high-intermediate. Can be used alongside Stand Out or as a supplement to other courses.
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http://usafiles.net/Cua/Stand_Out_Basic_Grammar_Challenge_1st_Edition.pdf