21.   Several factors are driving the activity.

22.   Several factors are driving the price increase.

23.   Some researchers, however, suggested that other factors might have driven down the death rate.

24.   The timing is being driven by factors beyond stock market sentiment.

25.   The weather was not the only factor in driving up job creation last month.

26.   These factors have driven several recent transactions, in addition to the failed effort by PricewaterhouseCoopers to sell its consulting arm.

27.   Two factors are driving the change.

28.   Two factors have driven the changes over the last decade.

29.   It is driven by factors like improved organization and transportation, skills of workers, and the development of new technology.

30.   Several factors are driving the current boom, including low interest rates and the strong stock market to help keep investors calm as the transactions proceed, Adelson said.