11.   From punishing Serbian aggression in Kosovo, NATO must now act to prevent it.

12.   Goldstein repeated claims by many settlers here that his son had acted to prevent a planned massacre of Jews by Arabs.

13.   Here we are trying to do something that requires a higher degree of responsiblity, which is to act to prevent a crisis.

14.   If things get bad enough in the Palestinian territories, however, some analysts believe Egypt and Jordan may be forced to act to prevent revolutions at home.

15.   In acting now, Greenspan is also illustrating his belief that monetary policy needs to act to prevent problems in the economy, not just to rectify them.

16.   In its normal molecular form it acts to prevent the development of breast tumors.

17.   It is a threat, it is a danger to our world and we must heed that threat and act to prevent it being realized ...

18.   Investors who lost money with A.R. Baron say that Bear Stearns should have known that the smaller firm was committing securities fraud and should have acted to prevent it.

19.   Just as firmly, Giuliani and Police Commissioner Howard Safir promised that the city would act to prevent the rally from being held without the required city permits.

20.   More than half of the homeowners surveyed said they did not know they could act to prevent tornado damage to their homes.