Exprésate 1
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Ch.1
Ch.2
Ch.3
Ch.4
Ch.5
Ch.6
Ch.7
Ch.8
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Lesson 1: Prepositions, Part 1
http://www.youtube.com/watch?v=xoiN5SMwLBE
Lesson 2: Prepositions, Part 2
http://www.youtube.com/watch?v=tT0VdsVm_lQ