Scores of Utahns put on their walking shoes Saturday for the Church World Service/CROP Walk to combat emergency food supply shortages. Participants from Salt Lake City, shown here, and the Brigham City and Provo-Orem areas _ many decorated with or carrying balloons _ joined in walk-a-thons, part of the weekend's "Hunger Sabbath '88." They brought canned goods to the walk for local food pantries and solicited sponsors willing to pay for each mile walked. Salt Lakers hiked from Liberty Park to the Utahns Against Hunger offices, 21 G St.