In a large mixing bowl, dissolve yeast in a 1/2 cup of the warm water. Add sugar, oil, salt, rye or whole-wheat flour, 3 cups of the all-purpose flour and remaining 1-1/2 cups warm water. Beat until smooth. Add enough remaining all-purpose flour to form soft dough.
Turn unto a floured board, knead until smooth and elastic, about 6 to 8 minutes. Place in greased bowl; grease top. Cover and let rise in warm place until doubled; about 1-1/2 hours. Punch dough down; divide in half.
On greased baking sheet, flatten each half to 1-inch thickness. Pierce each loaf several times with fork. Cover and let rise in warm place until nearly doubled, about 1 hour.
Bake at 375 degrees for 25 to 30 minutes or until golden brown. Yield: 2 loaves. Easy and delicious.