Decide a topic sentence from an article

Today teacher give us some article that it doesn'c conclude topic sentence. She teach us how to dip a suitable topic sentence. First, you need to read over all the content. Sencon, focus on the finall paragraph especially the final sentence. Then writting the topic sentence as you can do the best but depend on the finall sentence.

Why did you choose your major?

I decided to study Mechanic in may, 2001. The reason was depend on my interesting. Since my childhood, I fell in any machine as like washing machine, clock, electric fan...etc. When I took apart the machine to trim the component. I found out the relish that is machine. Therefore, I choused an alternative academic track to ME in KUAS .

Everybody had a beautiful dream in own childhood, the same to me.
When I was a boy, I wanted to be a scientist to create something changing the world.
Therefore, I always interested in any machine include washing machine, bicycle, clock, or relationship with mechanical. One day my mom bought me a car toy for my birthday present. When I saw the car, I started thinking about why this car can move.
Then, I did something that led my mom crazy, taking apart it. After understanding the car component, I fabricated it again.

Because of the top reason, my parents told me that I can study mechanic in the future.
Until now, I am appreciate my parents who told me the way . Now, I feel great in my major. Even all the subjects are not very easy to me, but I believe I can pass all the challenge.

Why did you choose your major?

I decided to study Mechanic in may, 2001. The reason was depend on my interesting.
Since my childhood, I fell in any machine as like washing machine, clock, electric fan...etc.
When I took apart the machine to tirm the component. I found out the relish that is machine.
Therefore, I choosed an alternative academic track to ME in KUAS .