2--Thank you.
 
1--I hope they fit.
 
2--I hope you kept the receipt.
 
1--You think they won't fit?
 
2--I think I've put on some weight.
 
1--You think?
 
2--Maybe a pound or two.
 
1--Maybe four or five pounds?
 
2--My waist is bigger than it was.
 
1--No problem. These pants have an elastic waistband.
 
2--You are so smart!
 
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注解：
 
1.fit合身 
2.receipt收据  
3.elastic松紧带       

===================================
译文：

1--我给你买了一条裤子。
2--谢谢你。
1--我希望它们合身。
2--我希望你保留了收据。
1--你认为他们不适合吗?
2--我想我胖了一些。
1--你这样认为吗？
2--可能1磅或2磅。
1--或许是四五磅？
2--我的腰比以前粗了。
1--没问题。这条裤子有松紧腰带。
2--你真聪明！