阅读下面的短文，在空白处填入一个适当的词，或填入括号中所给单词的正确形式。

    My friend John has got  restaurant in a big city. It is near a supermarket. There are ten robots(机器人) the restaurant. The robots do different (job) for John. Look! One robot is cooking food; two robots  (wash) the dishes; three of them are giving food to the customers. John is good at studying robots and he (know) robots very well I think in the future, there will be a lot of robots working for us in the world.