11.   Changes in the economic base of society determine shifts in the political and legal superstructure.

12.   Environmental policy subsequently underwent dramatic shifts in both stride and direction.

13.   Even so, this shift in thinking is taking place at an awkward time.

14.   For in practice, the shift in the focus of monetary policy meant that interest rates would swing wildly.

15.   He claimed that the site was geologically unsound and any stress caused by a shift in water levels could cause an earthquake.

16.   His embrace of recorded music over live performances would eventually lead to a shift in the role of records on radio.

17.   However, a shift in the type of sediment from weathered to unweathered material is noted at this level.

18.   Increased spending on the armed forces Marks a dramatic shift in priorities.

19.   It is predicted that these changes will result in significance shifts in the rating burden.