单项选择题
A. no traffic is allowed on some streets B. traffic is computer-controlled C. cars move very slowly D. only one way streets are open to traffic
A.staffs B.lessons C.buildings D.graduates
A. Tips are not usually included in the total check. B. A 15 percent tip in large cities indicates satisfactory service. C. People tip waiters and waitresses. D. People always put tips on the table.