In large bowl, combine 1 cup flour, sugar, salt and yeast; mix well. In small saucepan, heat 1 cup water and shortening until very warm (120 to 130°F.). Add warm liquid to flour mixture; blend at low speed until moistened. Beat 3 minutes at medium speed. Stir in an additional 1 1/2 to 1 3/4 cups flour until dough pulls cleanly away from sides of bowl.