One of the most convenient and cheapest ways to see America is by riding a Greyhound bus. This interstate bus system connects all major cities in the United States,【C1】______ people with frequent and convenient service. The bus system even has an international service【C2】______ makes connection with cities in Canada and Mexico. Its network even extends to some of the smaller towns and out-of-the-way communities【C3】______ the great interior of the country. Traveling by bus may【C4】______ longer than flying by plane, but the terminals are located in the center of most cities and there is【C5】______ to the downtown area. These buses are comfortable and air-conditioned. They are all equipped with toilets in the rear to【C6】______ the convenience of the passengers, but there are some very severe【C7】______ of conduct which are strictly enforced. On all buses【C8】______ is forbidden and the consumption of alcoholic drinks is not allowed. 【C9】______ bus travel may not be suited to everyone's taste, it affords budget travelers the【C10】______ to see America in comfort and safety and at a leisurely unhurried pace.