题目内容：

文中共有10处语言错误，每句中最多有两处。错误仅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。

Dentists often ask questions when it is impossibly to answer. My dentist had pulled out one of my tooth and told me to rest for a while. I tried to say something, but my mouth was full of cotton. He knew I collected match box. He advised that I devote myself to collect what it was worth. He then asked me that I liked my new job in London. To these questions, I either nodded and made strange noises. Meanwhile, my tongue was busy search the hole where the tooth had been. I suddenly felt very worried about , but I could not say anything. When the dentist finally finished his job, I told him that it was the wrong tooth which he had pulled out .

Ouch, it was the first time that I suffered such pain in my life.