Across
- 4. beneficial or useful.
- 5. to go faster.
- 6. a general business or activity.
- 9. The process of burning.
- 10. a machine for forcing air into an engine.
Down
- 1. to change design.
- 2. when the first astronaut went to space.
- 3. a device for mixing vaporized fuel with air.
- 7. A race with 2 cars right next to each other.
- 8. a unit for measuring how fast your going.