31. Rings used to be cast in iron in the most unattractive and simple form to show the nature of work . 32. The popular vacation owes its birth to such factors as the changing nature of work and the rise of the railroad. 33. "The Culture of Collaboration " explores how collaborative culture is changing business models and the nature of work . 34. Labor unions, companies, and government institutions will have to adjust to the fact that the nature of work has changed. 35. Since then, several meetings have been held between officials of HVP and CAGS members to discuss the nature of work involved. 36. We're showing people we can represent them in very different ways as we see the nature of work changing ." 37. The sisters said that they agreed to join the charity as 14-year-olds without realizing the nature of work involved. 38. He said the nature of work being carried out at present made it necessary for the developer to close the interchange to traffic. 39. The information gathered though these surveys will also indicate the extent and nature of work -related activities by children in these countries. 40. Michael Feuer, the chief executive of Officemax, said a shift in the nature of work had further expanded demand for office supplies.