11.   Air pollution may also be a contributory factor.

12.   Some scientists have pointed to a recent brightening of the sun as an important contributory factor to global warming.

13.   Research shows that diet is a very strong contributory factor to migraine.

14.   His close, intimate relationship with his personal assistant, Marissa Kenton, had also been a major contributory factor.

15.   The TUC cites the strong pound, the uniform business rate and lack of infrastructural investment as contributory factors in the regions problems.

16.   The greatest contributory factor, however, in choosing to settle in the city was their confidence in the ability to walk in the streets at night in safety.

17.   Police enforcement, greater awareness of road safety and heavier sentences for reckless driving are major contributory factors.

18.   Camdessus defended the IMF programme in Indonesia, and stressed that it was not a contributory factor to the recent political turmoil that was going on there.

19.   But, can you demonstrate that it is a significant contributory factor in the learning and skills development of your students?

20.   Col. M. Iriawan said that three men were still being questioned to ascertain whether recklessness was a contributory factor.