[解析]
M:I'm terribly sorry,Tina,I've broken your glass.I was looking for the dictionary.You borrowed from me yesterday on the desk.While you were out for a break.
W:Well it doesn't matter.It's my fault.I forgot to return it to you on time after I used it to look up some words in it.I should say sorry to you first.
M:I need it badly now,so I begin to search for it on your desk.I should have been careful.I'll pay for it.
W:No,there is no need to pay.You treat me an ice cream after class.That's enough.