阅读下面短文，按照句子结构的语法性和上下文连贯的要求，在空格处填入一个适当的词或使用括号中词语的正确形式填空。

    One day a dentist (牙医) was starting his morning work. (sudden) a man ran in. His face was red, he could only say “Quick! Quick!” The dentist thought he must be very (illness). His assistant (助手) helped to make the poor man sit in the chair. The dentist (give) the man some medicine (make) the man sleep. Then, he looked into the (man) mouth and pulled out all the bad (tooth). As soon the man woke up，he said in a low voice, “Quick, doctor, quick!”

    “It's all right now”, dentist told him, “It is over.”

    “You don't understand.” said the man. “I came to tell you that house is on fire."