1. 为什么不停下来休息呢?已经九点了.
（ Why not stop to have a rest? ）?it's already nine o'clock
2. 请你们保持教室的清洁好吗?
Would you please ( keep the classroom clean )?
3. 为了使你身体健康,你必须立刻停止吸烟
To keep healthy, (you must stop smoking at once )
4. 你愿意到我家来吃晚饭吗?
(Would you like to come to my home ) for supper?
5. 他用了一年的时间准备这次考试
It (ttook him one year to prepare for ) the exam.