America is a very large country, but traveling there is really very quick and easy. When you are paying a visit to the USA and want to see as much of the (1) as possible, you'd better travel by bus. There is fast 2 service between cities, for example, the Greyhound Bus Service. All of its buses have a picture of a dog on the side. Some buses have two storeys（层）. The top covering of the bus is often made of glass. In the summer time, the heat of the sun will get in (3) the glass and you may (4) too hot. Although the buses are cooled by air-conditioner（空调）, it doesn't (5) work well because the sunshine on the top storey is too (6) . The seats are very soft. Over each seat there is a reading light. On the long-distance journey, stops are made for meals at roadside (7) . You can have enough time to stretch your legs and have a good taste of food. It takes about three and a half (8) to cross America by bus with short stops for meals. Many people, especially tourists, like to (9) a bus around the country. If you have chances to visit America, don't (10) to try a bus.