填空题 Probably every town in the United States has a post office. Some are very small, and you may also find them in the 1 of a shop. Others are large buildings. They are open five days a week and Saturday morning. From Monday through Friday they are usually open from 8:30 am to 2 .
If you know how much the postage is for your letter, you can buy stamps at any 3 . In some post office you can buy stamps from machines. Stamps are sold at many different prices, from one cent to many dollars, ff you are not sun 4 postage is for your letter, you can ask the clerk. He or she will give you the stamps you need.
At a post office you can also buy postcards. A postcard is 5 than a letter.