All you need to do is fill in and submit the order form. The argumentative essay is based on facts and evidence. Here are some conclusion ideas: Think "big picture.
There is a clear emphasis on the data and facts you used. Chances are, you will hear someone trying to persuade another person to believe in their claim about: Is it true? The thesis should state your position and is usually the last sentence of your introduction.
These will be your topic sentences. Convince them that your side is the best one to take.