Dye is a substance that is used to change the color of something else. There are many different things that are used as dyes, and dyes can be used to make a huge variety of different colors. Some dyes are permanent, some are temporary.
A fly is a very common insect that can fly, as the name suggests. Flies lay their eggs in rotting food or dead animals in the wild, and in your house they lay their eggs in any of your food that they find. The eggs hatch into maggots.
French fries, also known as hot chips, are made from potatoes cut into long thin strips and then deep fried in oil. They are usually served hot, with salt. Very thin chips are sometimes called French fries.