B1
a substance that is burned to provide heat or power
Dictionary examples:
I use pizza as fuel for my late-night study sessions. (0.0)
The superhero's secret fuel was actually just a lot of coffee and donuts. (0.0)
The time machine ran out of fuel in the dinosaur age. Oops! (0.0)
fossil fuel (49.6)
Wood, coal, oil and gas are all different kinds of fuel. (70.0)