NaBr+H₂SO₄═HBr+NaHSO₄

CH₃CH₂CH₂CH₂OH+HBr $\stackrel{△}{\to }$  CH₃CH₂CH₂CH₂Br+H₂O

在圆底烧瓶中加入原料，充分振荡后加入几粒沸石，安装装置Ⅰ．加热至沸腾，反应约40min．待反应液冷却后，改装为装置Ⅱ，蒸出粗产品．部分物理性质列表如下：

将所得粗产品倒入分液漏斗中，先用10mL水洗涤，除去大部分水溶性杂质，然后依次用5mL浓硫酸、10mL水、10mL饱和NaHCO₃溶液、10mL水洗涤．分离出有机层，加入无水氯化钙固体，静置1h，过滤除去氯化钙，再常压蒸馏收集99～103℃馏分．

回答下列问题：

增加：在缺词处加一个漏字符号（∧），并在其下面写出该加的词。

删除：把多余的词用斜线（\）划掉。

修改：在错的词下划一横线，并在该词下面写出修改后的词。

注意：1.每处错误及其修改均仅限一词；2.只允许修改10处，多者（从第11处起）不计分。

    It is known that everyone have a dream. I have dreamed of being a doctor since I enter the primary school. With modern life go rapidly nowadays, many people suffer from different kind of diseases, both mentally and physically. As a result, doctors are in great need at home and abroad. My dream is to become successful doctor, helping to save people’s lives. Although to be a good doctor is very difficult, but nowadays I will do whatever I can to keep everyone health. To make ray dream come true, I have told me over and over again that I’ll pay more attention on studies. After all, only by working hardly can one succeed.

若要使得图中平面展开图折叠成正方体后，相对面上的两个数之和为5，求x+y+z的值．

 y=m$x^{m^2+2m+2}$是二次函数，则m的值为（　　）