Example sentences of "[verb] [adj] over a period " in BNC.
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| 1 | Other changes in structure developed more slowly , but although the pattern looked different over a period of a few years , analogues of the basic groups seem to have been present ever since the phenomenon of the contemporary football fan arose in the middle to late 1960s . |
| 2 | The Test of Professional Competence , for building surveyors , first introduced in 1973 , has remained unchanged over a period during which many other changes both technological and sociological have taken place within the Division . |
| 3 | Rudolph Ackermann issued some fifty books with coloured plates , including the well-known Repository of Arts , Literature , Commerce , Manufacture , and Politics , which appeared monthly over a period of nearly twenty years . |
| 4 | When established during the 1940s , nationalised industries were instructed to operate in the ‘ public interest ’ and to break even over a period of years . |
| 5 | It was not surprising that the amount spent on exploration sank from $760 million in the still relatively fat year of 1979 to between $120 and $150 million at the end of the 1980s and the size of known reserves remained static over a period of at least four years . |