Pita (Middle Eastern Bible or Pocket Bread)

1 package yeast
1 1/3 cups warm water
1 tablespoon vegetable oil
1 teaspoon granulated sugar
1 teaspoon salt
3 to 4 cups all-purpose flour

Dissolve yeast in warm water. Stir in oil, sugar and salt, then stir in 2 cups of the flour. Beat until smooth. Stir in remaining flour until the dough is easy to handle. Knead for 10 minutes. Cover and let rise in a greased bowl until double in size