一、单项选择（30分）
从每小题A、B、C、D中选出一个能填入句中空白处的最佳答案。
1. Buses _____ passengers.
A. are used to carrying B. are used to carry
C. used to carry D. get used to carry
2. —Is it easy for people from different countries to greet each other?
—I don’t think so. Because different countries have different _____ .
A. clothes B. food C. way D. customs
3. A driver is supposed _____ a seat belt in the car.
A. wearing B. to wear
C. to be worn D. to dress
