1. In the last act, a gaoler would always come on to the stage with a letter which he would hand to the prisoner.2.The curtain went up on the final act of the play and revealed the aristocrat sitting alone behind bars in his dark cell这里为什么一个用 in，一个用 on？
I saw my paper lying face down on my desk.分析：lying face down 在句中是修饰paper作定语吗？lying和face down之间是什么关系？改下面这样行不行？ I saw my paper facing down and lying on my desk.
...增长。该句中thanks to这一小句是做什么成分？2. We should, on the basis of our current conditions and bearing in mind the long-term goal, anvance structural reform. 我们应该立足自身，放眼长远，推进结构性改革。on the...这半句是什么成分？