37. The custom can be traced back to the roman era.付小费这种习俗这种风俗可以追溯到古罗马时代。38. A more common belief is tips were first given in the 18th century England...
13. College students were a major force in the campaign, although participants of all ages were involved.尽管参加这次运动的人涉及到各个年龄段的人，但是大学生是这场运动的主导力量。14. thir...
25. What they reject more than anything is conformity.他们所厌恶的莫过于循规蹈矩。26. These are not questions the old generations can shrug off lightly.对于这些问题，老一代人确...
take place发生，进行take the place of… 代替…make sense讲得通，有意义a great/good deal of大量(修饰不可数名词)influence on影响reply to…回答…，答复…once upon a time从前once in a while偶尔...