Our future house (1)_____on an ocean

Our future house (1)_____on an ocean. It will surrounded by tall trees and a blue sea but we only have saltwater in (2)______ ocean. We need fresh water(3)________ drinking and for growing food (4)______ games
      Ocean water is too salty to drink . It is also too salty for watering plants. We must have the (5)_______  tô make freshwater from salty water . We should be (6) _______ not to wastewater