题目内容：

语法填空，阅读下面材料，在空白处填入一个适当的内容（不多于3个单词）或括号内单词的正确形式。

When I was in elementary school, I always argued with a boy in my class. I have forgotten what the   1.   (argue) was about, but I have never forgotten the lesson I learnt that day.

I was convinced that “I” was right and “he” was wrong but he argued that “I” was wrong and “he” was right. The teacher decided to teach us    2.   very important lesson. She   3.   (bring) us up to the front of the class and placed the boy on the side of her desk and me on the other. In the middle of her desk, there was a large   4.  round object. She asked the boy what color the object was. “White”, he answered. I couldn’t believe    5.   he said, because it was   6.   (obvious) black! Another conflict started    7.   him and me, but this time it was about color of the object. The teacher told me to stand in the place 8.   the boy had been standing. We changed the place and now she asked me what the color of the object was. I had to answer, “White”. It was an object with two differently colored sides. From   9.   viewpoint it was white, but from my side it was black. Sometimes    10.   (look) at a problem from the other person’s view, we will come to a totally different conclusion.