Compound: A chemical bonding of two or more different. atoms
Solution: A homogenous mixture of two or more substances, all of which are in the same phase.
Colloid: A solution wherein the solute is small enough that it does not settle, and renders the solution cloudy.
Suspension: A solution wherein the solute does settle.
Element: A substance that can be found on the Periodic Table; the simplest form of matter that retains unique properties depending on the proportions of its constituent parts.
Alloy: A mixture of two or more elements, one of which is a metal.
For each of the items you want identified:
Tea: This depends on the particular cup of tea being considered. Any tea leaf particles would render it a suspension; however, pure tea "liquid" would probably be considered a solution.
10kt Gold: 10 karat indicates that the gold is not pure meaning it is an alloy.
Windex: A solution (mix of ammonia and water, which doesn't settle).
Seafood Gumbo: Compound (cooking creates new compounds).
Gasoline: A solution (mix of hydrocarbons that don't settle).