We thought the only thing we need to do was just pointing out No. X meal. But we were totally wrong. The girl asked so many questions and we understood almost nothing at first. Fortunately, she asked us in the way of "sth. or sth.". So every time I told her one of these two sth.s no matter if I knew it and got our lunch at last with highly tensioned brains. From then on, we dare not go to the McDonalds. :P. But maybe we'll try again after learning a lot from jabber's and other friends' posts.