Almost all cars convert gasoline into motion with a _____-stroke combustion cycle.

• one
  An internal combustion engine uses four strokes: intake, compression, combustion, exhaust.
• two
  An internal combustion engine uses four strokes: intake, compression, combustion, exhaust.
• three
  An internal combustion engine uses four strokes: intake, compression, combustion, exhaust.
• four
  An internal combustion engine uses four strokes: intake, compression, combustion, exhaust.
• five
  An internal combustion engine uses four strokes: intake, compression, combustion, exhaust.