ile:Lesson 6 Smash-and-grab_知识拓展（成人版）.mp4 file:Lesson 24 A skeleton in the cupboardr_知识拓展（成人版）.mp4 file:Lesson 56 Our neighbour, the river_知识拓展（成人版） .mp4 file:Lesson 11 Not guilty 单词讲解.mp4 file:Lesson 54 Instinct or cleverness 课文讲解.mp4 file:Lesson 44 Speed and comfort 课文讲解.mp4 file:Lesson 50 New Year resolutions 单词讲解.mp4