When I was in the elementary school ,I got into an argument

When I was in the elementary school ,I got into an argument with a boy in my class.I have forgotten what the argument was about ,but I will () forgotten the lesson I learned that day.
I thought that "I" was right and "he"was () ,but he thought that "I" was wrong and "he" was wright .The teacher decided to teach us a very () lesson.She brought ue to the front of the class and placed him on one side of her () and me on the other.
In the middle of her desk was a large ,round object .I could clearly see that it was black .She asked the boy what () the object was ."White," he answered.
I could't () what he said .The object was obviously black Another argument () between my classmate and me about the colour of the object.
The teacher told () to stand where the boy was standing and told him to come to stand where I had been .We changed places,and now she asked me what the colour of the object was .I had to answer,"()" The object had two () with different colours ,and from his side was it black.
My teacher taught me a very important lesson that day:Yon must stand in the other person's shoes in order to truly understand it.
1、A、justB、alreadyC、everD、never
2、A、rightB、worngC、kindD、polite
3、A、interestedB、importantC、badD、boring
4、A、tableB、deskC、chairD、office
5、A、sizeB、colourC、matterD、thing
6、A、believeB、hearC、thinkD、know
7、A、endedB、startedC、leftD、went
8、A、meB、himC、herD、us
9、A、BlackB、NothingC、WhiteD、Right
10、A、surfacesB、edgesC、areasD、sides