请按照顺序填空,备选项已给出如下 A customer is the most ( 1 ) visitor on our premises. He is not ( 2 ) on us. We are dependent on ( 3 ). He is not an ( 4 ) in our work. He is the purpose of it. He is not an ( 5 )in our business. He is part of it. We are not doing him a favour by serving him. He is doing ( 6 ) a favour by giving us an ( 7 ) to do so. (Kenneth B. Elliot) 备选项: us outsider him dependent interruption important opportunity