完形填空。通读下面的短文，从A、B、C三个选项中，选出一个最佳选项填空，使短文意思通顺，结构完整。

    One day, Mr John, a rich and fussy man, walked into a restaurant. He would like to have a meal there. The waiters of the restaurant felt terrible when they saw 1. They knew he always wanted the best but would only pay 2.

    A waiter gave the menu to Mr. John and he decided to order a bowl of oxtail soup. The waiter took the order and left as 3 as he could.

 4the dish was served. Mr. John tasted it and then called the waiter. All the waiters knew he would ask 5 the proof that the soup was made of real oxtail, 6, the smart waiter just smiled and went over. After listening to Mr. John's question, the waiter went into the kitchen and then he brought an ox with no tail. Mr. John had 7 to say but to go on with his meal.