阅读下面短文，完成已给了首字母的单词，使短文完整、通顺。
Time passes swiftly and never r____ Our three years of Junior high school life will come to an e____ We'll have to say goodbye to each other—to our best friends and to our beloved teachers. I have all the happy and sad m____ of the three years in my heart.
Three years ago, three boys came to a school from different places. They were my best friends and I. At that time, we were young and shy of each other. H____, as time went by, we became closer and closer. We studied hard together, played sports together and hung out with each other. When we failed exams, we e____ each other. We faced challenges together, and solved problems together. We s____ happiness and sadness, and grew up together.
Now, as best friends, we have to face the future separately (分离). Nothing can c____ the fact. I believe that, a____ we may end up in different high schools, our friendship will last.
I have one w____ for my friends. I hope they will get good grades in the high school e____ exams.
在其定义域内的一个子区间(k－1，k＋1)内不是单调函数，则实数k的取值范围是( )