VOCABULARY

  • battle
  • courteous
  • drift
  • emission
  • foul
  • gasoline
  • gross
  • inefficiently
  • mechanic
  • mention
  • pipe
  • polluter
  • pollution
  • purify
  • recommend
  • regular
  • relieve
  • sensor
  • specialize
  • stick
  • tail
  • vehicle
  • CLOSE