GrammarWork, English Exercises in Context, Second Edition, by Pamela Peterson Breyer, is a four-level series of exercise books that feature structures tied to meaningful contexts. Self-contained, contextualized exercises are designed for written practice; “Make It Work” sections enable students to apply what they have learned to realistic situations. Perforated answer keys are included.
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http://usafiles.net/A4v/GrammarWork_1.pdf
http://usafiles.net/A4w/GrammarWork_2.pdf