| 1. | A policeman must not smoke while he is on duty .
警察当班值勤时不得抽烟。 |
| 2. | Hery is on duty eight hours a day .
享利每天工作八小时。 |
| 3. | Experienced banquet waiters must also be on duty .
还必须让有经验的宴会服务员当班。 |
| 4. | He made it a rule that either he or his wife should always be on duty in the shop during opening hours .
他规定在开店时间，妻子和他轮流站柜台。 |
| 5. | What are you doing ? aren ' t you supposed to be on duty
你来干嘛?你不是在职勤吗 |
| 6. | Gwang - ho ! you were on duty during gym , right
光昊！体育课的时候你值班是吧？ |
| 7. | The switchboard operator is on duty from6to9
电话总机接线员六点至九点值班。 |
| 8. | Two other boys were on duty besides her
除了她之外，还有两个男孩是值日生。 |
| 9. | So , those two in the other room are on duty
另外房间的那两个在执勤吗？ |
| 10. | The rule is that someone must be on duty at all times
按照规定，任何时候均需有人值班。 |
