假定英语课上老师要求同桌之间交换修改作文，请你修改你同桌写的以下作文。文中共有10处语言错误，每句中最多有两处。每处错误仅涉及一个单词的增加、删除或修改。
注意：①每处错误及其修改均仅限一词；
②只允许修改10处，多者（从第11处起）不计分。
Last summer, I got a part-time job as a
waiter. I worked hard and very helpful. Everyone in a restaurant including some
regular customer liked me. One day, a foreign couple in their fifties entered
into the restaurant. I was happy to have a chance to practice their spoken
English. I went up to greet them warm. After I took their order, I told them
their food will be served quickly because we Chinese respect the elderly. After
heard my words, a look of displeasure appeared on the wife's face. Seeing my confusing
look, her husband explained to me the Westerners disliked the description "old".
I apologized to them but realized the importance of knowing cultural
differences.
