Definition: In this task, you will use your knowledge about language (and common sense) to determine what element the marked number refers to. The numbers are marked with two underlines around them, like: _ number _. Your answer should be chosen from the given text, and should not contain other words.
Input: George:  You know the great thing , though , is that change can be so constant you do n't even feel the difference until there is _ one _ . It can be so slow that you do n't even notice that your life is better or worse , until it is . Or it can just blow you away , make you something different in an instant . It happened to me .

change