11.  The driving force is ensuring satisfactory business returns.

12.  The driving force of a flourishing society is individual acquisitiveness which creates demands that boost trade and increase the general wealth.

13.  The driving force of the rain precluded conversation, sealed each of us in with his own thoughts.

14.  The other driving force is cold cash and order books.

15.  This possessiveness can be a driving force behind each craftsman and his task.

16.  United States defence spending has been a key driving force behind much of the electronics, telecommunications and computer industries.

17.  Was it feasible, was it remotely possible, that the mutation had some sort of driving force?

18.  We single out technology and the structure of international finance as the primary driving forces for change.

19.  Whatever the driving force, heat conservation has many advantages.