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file:Lesson 11：One good turn deserves another 礼尚往来.pdf file:Lesson 12：Goodbye and good luck 再见，一路顺风.pdf file:Lesson 8：The best and the worst 最好的和最差的.pdf file:Lesson 10：Not for jazz 不适于演奏爵士乐.pdf file:Lesson 7：Too late 为时太晚.pdf file:Lesson 9：A cold welcome 冷遇.pdf

file:Lesson 11：One good turn deserves another 礼尚往来.pdf file:Lesson 12：Goodbye and good luck 再见，一路顺风.pdf file:Lesson 8：The best and the worst 最好的和最差的.pdf file:Lesson 5：No wrong numbers 无错号之虞.pdf file:Lesson 10：Not for jazz 不适于演奏爵士乐.pdf file:Lesson 4：An exciting trip 激动人心的旅行.pdf file:Lesson 6：Percy Buttions 珀西·巴顿斯.pdf file:Lesson 7：Too late 为时太晚.pdf file:Lesson 9：A cold welcome 冷遇.pdf