Complete each of the following sentences with given word in bracket so that the new one has the same meaning with the old one. Do not change the given words in any way. 17. Air pollution deaths will double by 2050 if nations don’t act. (Unless)  ____________________________________________________________________. 18. Water pollution causes the death of all forms of life in the water bodies. (results)  ____________________________________________________________________. Finish the second sentence so that it means the same as the first one. 19. I think you should use energy efficient light bulbs.  If I _________________________________________________________________. 20. Due to the hurricane last night, I was without electric power.  Because there ________________________________________________________.