Hi everybody !In my english class, the teacher told us to write a short essay about "ADVERTISING" - the topic we learnt about. So I wrote an essay and I don't know how many mistakes it has ?!?

So please read , check and correct it for me . Thank you very much !!!
Here is my essay :
ADVERTISINGIf your parents tell you that they would buy a new PC for you, what will you do ? – Perhaps you should find as many advertisement for Pc as you can find in the newpapers or magazine (Of course, the best is low price and high quality !)
So advertising is so important with us now. It becomes so popular that we can see it everywhere: billboards, taxi doors, printed flyers, newspapers, town criers, TV, radio, the opening of a show, the back of a ticket and even on the Internet : Bulk mail( Spam), Web Popups, banner ,... But all kinds of advertisement have one purpose: Selling more and more things by all ways. But this is not the only purpose. Advertising introduces us many new products that we want to know ( what is it, where to buy, how to use and ... persuade us to buy them !) . Advertising, on its non-commercial side, is a powerful educational tool. It educated the public about HIV-AIDS, energy conservation, enviroment preservation ,,,...
Finally, in nowaday, we can’t live without advertising. This makes advertising become an art . They also call it the spark plug of the business world !