Our future house will be on the ocean. It will be surrounded by tall trees and blue sea. But we only have salt water in the ocean. We needs fresh water for (1) __________ and for growing food (2) __________ farms. Ocean water is too salty to drink. It is also too salty for watering plants. We must have the (3) __________ to make (4) __________ water from salty water. We should be (5) __________ not to waste water. 1. A. drinking B. drink C. to drink D. drinks 2. A. in B. on C. at D. for 3. A. polluted B. contaminated C. fresh D. salty 4. A. things B. suggestions C. ways D. ideas 5. A. careful B. careless C. carefully D. carelessly