【導讀】Lesson15. twenty-three. twenty-five. twenty-four. twenty-six. twenty-seven. twenty-eight. twenty-nine. thirtyfortyfifty. maths. class. ChineseEnglish. They'remaths,ChineseandEnglish.inthemorning. intheafternoon. music. art. PE. asksomequestions. 34. 61. 52. 14. 35. 2