In the following passage there are blanks, each of which has been numbered. For each number, five words are suggested one of which fits the blank appropriately. Find out the appropriate word in each case.                    Greenhouse gases are only (1) of the story when it comes to global warning. Changes to one part of climate system can (2) additional changes to the way the planet absorbs or reflects energy. These secondary changes are (3) climate feedbacks and they could more than the double the amount of warning caused by carbon dioxide alone. The primary feedbacks...