Prepositions

Do you know anything( about) Chinese food? I wonder (if) you have ever heard of fortune cookies. Fortune cookies are small biscuits that are traditionally served (at) the end of a meal in Chinese restaurants. They are sweet and have a piece of paper inside them. Written (on) the piece of paper is your fortune. They ofen say things like "You will be lucky (with) love.
Do you know how far ( away) the tradition goes?
The Chinese have always given each other sweet MoonCakes (for) special occasions. Many Chinese people went to America (to) work (on) the railway.Life was hard but (by) celebrations they put messages of hope inside biscuits.