单项选择题
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.
A. compress B. remove waste C. burn D. to enter the cylinder
A. their brains could not function efficiently any more B. the full development of both sides of their brain was achieved C. their bodies stopped working D. they were very old