填空题
[听力原文]
The favorite food in the United States is the hamburger, a kind of round sandwich containing grilled beef. A favorite place to buy hamburgers is fast food restaurants. At fast food restaurants, people order their food, wait a few minutes and carry it to their tables themselves. At some fast food restaurants, people can order their food, pay for it and pick it up without leaving their cars. There are many kinds of fast food restaurants in the United States. Most of them sell hamburgers, French fries and milk-shakes, which are traditionally popular foods among Americans. In addition, there are numerous fast food restaurants that serve Chinese food, Mexican food, Italian food, chicken, seafood and ice cream. The idea of the fast food restaurant is so popular that nearly every kind of food can be found in one.