11.  The exterior Decorations on the synthetic white-stone face underwent repeated changes.

12.  The precise number changes yearly as some systems undergo significant changes.

13.  They were, however, undergoing significant change in response to an increasingly competitive and volatile business environment.

14.  Under these conditions many solids undergo phase changes, and the nature of the accompanying changes in structure can be studied.

15.  Family life has undergone dramatic change in recent years.

16.  During weightlessness, the forces within the body undergo dramatic change.

17.  Vietnam was attempting to make the transition to socialism at a time when the international situation had undergone major changes.

18.  The literatures of stable sciences show longer half-lives than those undergoing major changes in content and techniques.

19.  Some of its members undergo a change of attitude as the team goes about its ordinary work.

20.  When a substance undergoes a physical or chemical change a corresponding change in enthalpy is observed.