II. Read and underline the best answer: (1,25m) Our future house will be on (a/ an / the) ocean. It will be surrounded (by/ on/ at /with) tall trees and blue sea. But we only have salt water in the ocean. We need fresh water for (drink/drinking/ to drink/ to drinking) and for growing food (in/on/at/into) farms. Ocean water is too salty (drink/drinking/ to drink/ to drinking). It is also too salty for watering plants. We must have the ways to make fresh water from salty water. We should be (careful/ careless/ carefully/ carelessly) not to waste water.