Use of English PRO

I work (0) AS a motocross stunt rider - that is, I do tricks on my motorbike at shows. The Le Mans racetrack in France was (1) ............ I first saw some guys doing motorbike stunts. I'd never seen anyone riding a motorbike using just the back wheel before and I was (2) ............ impressed I went straight home and taught (3) ............ to do the same. It wasn't very long before I began to earn my living at shows performing my own motorbike stunts. I have a degree (4) ............ mechanical engineering; this helps me to look at the physics (5) ............ lies behind each stunt. In addition to being responsible for designing changes to the motorbike, I have to work (6) ............ every stunt I do. People often think that my work is very dangerous, but, apart (7) ............ some minor mechanical problem happening occasionally during a stunt, nothing ever goes wrong. I never feel in (8) ............ kind of danger because I'm very experienced.