I'd agree, being asked to do such things at the last minute would be very frustrating to the majority of teachers and you would have a genuine grievance as a teacher if you were asked to live and work under such circumstances.

I have experience of such situations both first and second hand but i have also experienced the positive aspects of living and working in China and that has provided me with some perspective on the situation. You bought in several examples of times when a teacher might be asked to go beyond the job they were hired to do. They are reasonable examples but i can't believe that they happen to every teacher, every week at every school. In regards "winning the argument", I'm happy to be proved wrong if you can provide me with some reasonable facts to back up your rather overzealous approach to the subject.