51.   Some have long blamed humans, but other experts say it could have been climate change, disease or a gradual change in habitat.

52.   While market opening agreements with the EU and the United States call for gradual changes after China becomes a WTO member, they spell major changes for many industries.

53.   On Friday, De Klerk urged the NP should make only gradual changes.

54.   Rather than denazification, it was the return to prosperity and gradual social change which planted the new federal republic firmly in the democratic camp.