Preheat oven to 350 degrees F. Sift together flour, cinnamon, ginger, and soda; set aside. Cream oleo and sugar well. Add egg, and mix well. Then add molasses, and mix well. Add dry ingredients a little at a time. Roll into walnut-sized balls, and press with glass dipped in sugar. (Easier to handle if chilled a bit.) Bake for 10 mins. On ungreased cookie sheet.