10．
When I was in elementary school, I got into a major argument with a boy. I have forgotten what it was about, but I have never forgotten what I learned that day.
I (1) （think） that “I” was right and “he” was wrong, but he argued that “I” was wrong and “he” was right. The teacher decided (2) （teach）us a very important (3) . After she brought us up to the front of the class, she placed the boy on one side of her desk and (4) （I）on the other. In the middle of her desk, there (5) （be）a large and round object. I could clearly see that it was black. But the boy said it was white! Another argument started (6) us. The teacher told me to stand (7) the boy had been standing and told him to stand at my former place. We changed (8) （place）, and now I could see the color was “white.”
It was an object with two differently (9) （color） sides. From his viewpoint it was white, but from my side it was black. Sometimes we need to look at a problem from the other person’s view in order to (10) （true） understand his or her view.