My younger brother John has a toothache last night. This morning, my mother took him to see a dentist. Go into hospital was always very frightened for John. He struggled to get away while the dentist was giving him examination. He yelled terribly when the dentist was pulling his tooth. Several minutes late, the dentist got everything finished. “I’m sorry, madam, and I shall have to charge you 200 dollars for pulling your boy tooth. ” “200 dollars! Why, you said that he would charge only 40 dollars for such work!” “Yes, but your boy yelled so loudly that he had scared four other patient out of the office.”has→had
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(答案→)has→had
解析：
【小题1】 has→had 本文的基本时态是一般过去时，故使用had。
【小题2】Go —Going 本句是动名词短语doing在句中作主语，动名词表示的是经常性习惯性的行为。
【小题3】frightened →frightening 本句的主语是一个表示行为的动名词短语，故使用现在分词转换的形容词frightening（令人害怕的）在句中作宾语。
【小题4】examination 前加an 名词examination是一个可数名词，前面使用an表示泛指。指牙医给他做一个检查。
【小题5】 late →later 固定用法“一段时间+later”表示一段时间以后。
【小题6】and →but 固定搭配I am sorry, but…；句中的but是不需要翻译出来的。
【小题7】boy →boy’s 本句使用所有格的形式，指boy’s tooth男孩的牙齿。
【小题8】 he →you 上下文串联：你说过你要价40美元。要把这里的he改成you和主语You匹配。
【小题9】去掉had 过去完成时表示在过去的过去就发生的事情，而本句的动作是在yelled后面发生的，故使用一般过去时即可。
【小题10】patient →patients 前面有数词four说明后面使用复数形式。