如图为一氧化碳还原氧化铜的装置图：

（1）图中A处的实验现象是 ____，B处的实验现象是____．

（2）A处反应的化学方程式为 ____,　 B处反应的化学方程式为  ____.

（3）该装置存在的主要问题是____，改进的具体措施是____．

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（＼）划掉。

修改：在错的词下画横线, 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。

    Thank you for your invitation to dinner at your home tomorrow evening. Unfortunately, it is much to my regret which I cannot join in you and your family. I will be full occupied with an important exam come the day after tomorrow. I feel terribly sorry for missing the chance of so a happy get-together. I hope that all of you enjoying a good time. Is it possible for you and I to have a private meeting afterward? If so, please don't hesitate to tell me your preferable dates. I am eager for a pleasant chat about you.

    Please allow me say sorry again.