Answer:
I am long and slim works in light. Has but one eye and an awful bite.
First you see me in the grass dressed in yellow gay; next I am in dainty white, then I fly away. What am I?
Flat as a leaf, round as a ring; have two eyes, can't see a thing. What am I?
I am a path between high natural masses; remove the first letter to get a path between man-made masses.
I am lighter than the material I am made of. You see parts of me but more of me is hidden underneath.
If you can get this professional's attention you can get where you need to go for a price.