1.   So what do we do to prevent history repeating itself?

2.   What is your country doing to prevent Pol Pot and the Khmer Rouge returning to power?

3.   This is done to prevent the process log becoming too large.

4.   Can anything be done to prevent this?

5.   In such circumstances, there is nothing that the directors can do to prevent shareholders selling a controlling interest if they so wish.

6.   Tonight, in the second of two reports we look at work being done to prevent the spread of Aids and the hopes for a medical breakthrough.

7.   But staff at Stoke Mandeville believe there was nothing they could have done to prevent this incident...

8.   When the hue and cry died down, there was nothing Charlton could do to prevent Lawrence taking on a new challenge.