Brasilia, where I was...
driven a cart - car or cart? You use both
Francesca, who didnīt want to drive,
The race started and I was in the third place.
looked at Francesca
but I saw him too late; I was trying to break while he was looking up at the sky and we collided.
killed a man, when my friend
jumped too. Everybody cried
Your writing's fine- very few mistakes, but you tend tyo write comma splices ( http://www.usingenglish.com/articles/comma-splice.html ), so check your punctuation.