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.
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.
例：What is the government's policy on this issue?
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.