VOCABULARY

  • battle

  • courteous

  • drift

  • emission

  • foul

  • gasoline

  • gross

  • inefficiently

  • mechanic

  • mention

  • pipe

  • polluter

  • pollution

  • purify

  • recommend

  • regular

  • relieve

  • sensor

  • specialize

  • stick

  • tail

  • vehicle

  • CLOSE