Part A 
A: How much does that pen cost? 
B: It costs ten dollars. 
A: That's very expensive. Do you have anything cheaper? 
B: Sure. This pen is only two dollars. 
A: Good. I'll take it. 
甲:那枝笔要多少钱? 
乙:十块钱。 
甲:那很贵。你们有没有比较便宜的? 
乙:当然。这枝笔只要两块钱。 
甲:好。我就买这枝。 
Part B 
A: How much is this book? 
B: It's seven dollars. 
A: Do you have change for a hundred? 
B: No problem. 
A: OK. Here's the money. 
B: Thank you. Here's the book and your change. 
甲:这本书要多少钱? 
乙:七块钱。 
甲:你有零钱找开100块吗? 
乙:没问题。 
甲:好。钱给你。 
乙:谢谢。这儿是您的书和零钱。