The old man______ the street when he was hit by a car.

量子通讯卫星是一种传输高效的通信卫星，彻底杜绝间谍窃听及破解的保密通信技术，具有很强的抗衡外国的网络攻击与防御能力，2016年8月16日，我国首颗量子卫星（“墨子号”）成功升空，运行在高度约500km的圆形轨道上，下列说法正确的是（   ）

假定英语课上老师要求同桌之间交换修改作文，请你修改你同桌写的以下短文。短文中共有10处错误，每句中最多有两处。错误涉及一个单词的增加、删除或修改。

增加：在缺词处加一个漏字符号(∧), 并在此符号下面写出该加的词。

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。

    At a sports meet of high school I knew Christie and we became best friend. At that time, we often spend time together. Under her help, I made great progress in my study. Last year, she decided to study in abroad. In other words, we would be separated for long time. Before she leaving , I prepared a gift to show my best wishes to him. She said it was the best gift she has ever had. Until then, we've kept in touch with each other through e-mails. I look forward to see her again in the near future.