m: fast food restaurants are popular now.
l: they are popular for quick, inexpensive meals or snacks.
s: what would you like to eat?
l: i'll try a steak sandwich with a hamburger.
m: sounds good. i think i'll have the same.
s: want something to drink?
l: coke, please.
m: a cup of hot chocolate would be fine.
情景十：兩個不認識的人在公車站牌等車聊天。（相互認識，聊天，車到站結尾）
情景十一：兩同學一起到商店買鋼筆，兩人配合分工與老闆進行問價，砍價，成交，找零。
情景十二：一同學在14路公車上碰到高中同學。（驚訝，喜悅，交談自身現況，到站分開）
情景十三：某同學到書店購買書籍，與老闆交流詢問書籍，要求老闆推薦好書，成功購書結束。