改错

下面短文中共有10处错误，每句最多有两处.错误涉及一个单词的增加、删除或修改。

增加：在缺词处加一个漏词符号(∧)，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。

     Thank you very much for invite me to your birthday party in Saturday morning. I'd like to

come and I have to go to my hometown to see my grandparents. They were very old and unluckily

they are not in a good health recently. My mother has already made a telephone calling to them

and promised visit them with me this Saturday. My mother said we will stay at my grandparents'

the whole weekend. So I'm real sorry I can't attend your party. I do hope you will understand all

this. Here I wish you a lot fun on your birthday and many happy returns of the day.

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对羟基苯甲醛是一种合成医药、香料、液晶材料的重要中间体，以对甲基苯酚（  

） 为主要原料合成对羟基苯甲醛（ 

） 的工艺 流程如图所示．

（1）写出反应Ⅱ化学方程式______，B能跟银氨溶液反应生成银，写出该反应的化学方程式______．

（2）在生产中不直接用氧气氧化对甲基苯酚的原因是______．

（3）写出对羟基苯甲醛在一定条件下与足量氢气反应的化学方程式______．

（4）对羟基苯甲醛有多种同分异构体，其中苯环上只有一个侧链的同分异构体的结构简式为______．