The theme is "Anything is possible; don't let anybody or anything get in your way."
1. Inclined
Inclined means to be favorable towards something. In this sentence Jacob is not inclined or not in favor of switching spots with anyone else in the car.
2. incisive
Incisive means cutting (think incision like in surgery). In this case the word biting is the context clue that tells us incisive, or cutting, would be the best fit.
