http://www.scribd.com/doc/20421147/Exercise-7
http://www.scribd.com/doc/20420995/Exercise-7
http://www.scribd.com/doc/19100332/Exercise-Chapter8
http://www.scribd.com/doc/18992216/Exercise-42-Group-Work
http://www.scribd.com/doc/18813218/exercise-314-MA
http://www.scribd.com/doc/18812342/exercise-38-MA
http://www.scribd.com/doc/18811848/exercise-35-MA
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