修改：在错的词下画一横线，并在该词下面写出修改后的词。

注意：1）每处错误及其修改仅限一词；

2）只允许修改10处，多者（从第11处起）不计分。

    Mr. Grey usually went to work by subway. He liked walking from a station to his office unless it was raining, because he could take some exercises. One morning he was walking along the street while a stranger stopped him and said to him, “You may not remember me, sir, but seven years before I came to London without a penny in my pockets. I stopped you in this street and asked you lend me some money, and you give me £5. You said you were willing to take a chance to give us a new start.” Mr. Grey felt a bit of surprised and thought for a few minutes. Then he said, “Yes, I remember you. Going on with your story.” “Well,” answered the stranger, “were you still willing to take a chance?”

校运会4×100米接力赛在雨中进行着，现场一片欢腾。

       要求：①扩写；②内容符合情境并运用恰当的描写方法；③字数150字左右。

某实验小组进行了“测定某种食物中的能量”的实验，准备测定的食物是花生和玉米．他们为了防止热量的散失，将课本中的实验装置进行了改进，即在锥形瓶外套上了一个隔热玻璃罩，设计如图所示，请你帮助他们回答下面问题：

（1）本小组要研究的问题是____ 。

（2）如果实验过程中把质量相同的花生和玉米点燃，加热相同质量、温度的清水，哪一个放出能量多？你作出的假设是____ 放出能量多．（资料提示：1mL水每升高1℃需要吸收4.2J的热量）

（3）本小组探究计划的要点（见下表并将计算数据填入表格）

（4）实际上种子全部燃烧产生的热量比上述热量____  。（填“多”或“少”）

（5）得出的结论是____ 放出能量多，你作出的假设____ （填“成立”或“不成立”）

（6）这个探究实验只做一次，实验结果可靠吗？____ 。

一辆公共汽车原有m名乘客，在振华商厦站下去5人，又上来n人。