Basting is a way of keeping meat moist while it is being cooked slowly, such as when it is being baked. You baste something when you pour a little liquid over it while it is cooking. Meat is usually basted with its own juices from the bottom of the pan, or with marinade.
If something is misplaced it is lost or in the wrong place. If you misplace your car keys, they're not in their usual location. If you find one pineapple in the cereal aisle instead of with the rest of the pineapples at the grocery store, the pineapple has been misplaced.
Raced is the past tense of race. For example, "the children raced each other to the corner".
You taste things with your tongue. Food can taste sweet, sour, bitter or salty. Most people like the taste of sweet things best.
Toothpaste is used with a toothbrush to keep your teeth clean. It is usually mint flavoured, and can contain extra things like calcium and fluoride to keep your teeth strong. Brushing your teeth with toothpaste keeps your gums healthy, stops your teeth from decaying, makes your breath smell better and keeps your teeth whiter. Toothpaste is not meant to be swallowed, and you should spit it out after you clean your teeth.
Your waist is the middle part of your body. Your belly button is on your waist. Belts go around your waist, and skirts and jeans fasten around your waist.
You waste something when you have it, but you don't use it, or you use it for less important things. Someone might waste their money by buying lots of pairs of shoes and then complaining later they have no money for other things. Waste is also leftovers, or something that is no longer needed and becomes trash. Anything you throw away is waste.