Complete the summary of the text The Surprising Purpose of Travel Travel is 1 and sometimes even unpleasant; then what is the driving force behind our travel? We travel because we need to. Sometimes our travel is a 2 because we should attend the business luncheon, because we should celebrate Thanksgiving with our mom. We travel because we want to. Owing to the fact that most travel is 3 , we just travel following our heart. Most people travel for the sake of 4 , but their mind tends to solve the stubborn 5 issues while on vacation. What is the real purpose of travel? Travelling to a new place can make us less controlled by familiar cognitive 6 that imprison us. As a result, we can better combine the new with the old, the mundane is 7 from a slightly more abstract perspective. To 8 travelers, multicultural contrast means that they are open to ambiguity and willing to see the world in different ways, thus to expand the 9 of their “cognitive inputs” as they refuse to 10 their first answers and initial guesses. Of course, that mental flexibility is a side effect of difference and we know what we did not know in the past, by which we become more open-minded and less 11 . Apart from its advantages, travel also has it 12 , which make us not take great pleasantness. More often than not, we need a 13 after our vacation. We travel because we need to , because distance and difference are the 14 of creativity. Travel will change our mind to some extent, which in turn can have 15 on everything in our life.