Answer:
introduce the main point of the essay
The visit to the National Science Exhibition was a really rewarding experience. Since I was a kid I have been always attracted to science, specifically chemistry, because I have always had a lot of questions about how everything is composed. In the Exhibition I could see many experiments which show in an easy way how to understand chemistry in a simple way, for example I learnt how to turn on a lightbulb with copper and a potatoe.
This event opened my mind and now I am sure I want to be a scientist.
The address delivered by President J.F Kennedy at Rice University, in Houston, Texas on the Nation's Space Effort, which was given on the 12th day of September, <span>1962 has been considered to be a great speech because i</span>t persuaded people to support space exploration.
I believe it is A due to "The lady made detailed plans, engaged the caterer and the orchestra well in advance" isn't exactly connect well and be hard to understand so you'd put a comma between "caterer, and".
