Last summer， Mark became a middle school student．He took an English test in the first month． Mark was a good student and he worked hard．He finished the questions easily until he read the last one：“Everyone sees our school's gatekeeper every day．What's his first name?”
Of course，this question is a little special．Mark saw the man some times．He was tall and had a square face．But Mark didn't talk with him and didn't know his first name．The test was over．Then one student asked the teacher，“Is the last question very important in this test?”，“Yes，”said the teacher．“In our life，we will meet many people．Everyone is important．You should care about them．You may only smile at them or say 'hello' to them．”
Mark never forgot that question．He also learned that man's first name．It was William．
