1.   For years, Whitewater investigators have been interested in determining precisely what issues troubled Foster in the final days of his life.

2.   The accountability issue troubles others, as well.

3.   The issue troubles Democrats because of the ammunition it will provide to the Republicans if the vice president is nominated.

4.   The issue troubles Dr. Aubrey Milunsky, director of the Center for Human Genetics at the Boston University School of Medicine.

5.   Though this water issue troubles me.