Most stores in America have return and exchange policies. If, for instance, you buy a shirt and find out when you try it on that it's too small, you can take it back to the store and exchange it for a larger size. At many stores it is also possible to return items for a refund, though there is usually a time limit. Also, not all items can be returned. Books, swimsuits and CDs (if they've been opened), for example, cannot be returned. When you make a purchase, it's always a good idea to find out the store's return and exchange policy.
1.return n.& vt.归还; 返回; 恢复
例：Please return my book as soon as possible.
2.exchange n.& vt.交换; 交易
例：I'd like to exchange this shirt for one in a larger size.
3.policy n.政策; 规定
例：What is the government's policy on this issue?
4.refund n.退款; 退还
例：If your new radio doesn't work, you should take it back for a refund.
5.purchase n.& vt.购物， 采购
例：Henry purchased several items at the jewelry store.