5) a: i‘m sorry, but i have to cancel out luncheon appointment. 
    b: i‘m sorry to hear that. 
    a: i have pressing business to attend to . 
    b: no problem. we‘ll make it later in the month .

    a:真抱歉，不过我不得不取消我们午餐的约会。 
    b:真遗憾。 
    a:我有紧急的事情要处理。 
    b:没关系，这个月改天再说吧。

    6) a: i need to change the time we meet for lunch. 
    b: what time would be good for you? 
    a: i‘ll be about half an hour late. 
    b: good, i‘ll see you there at 12:30.

    a:我需要更改我们见面吃午饭的时间。 
    b:什么时间你合适呢？ 
    a:我大概要慢半个小时。 
    b:好的，十二点我会在那儿与你碰面。

    7) a: i‘ll get the check. 
    b: no, let me pay this time. 　
    a: no, i insist. 
    b: well, thank you very much.

    a:我来付帐。 
    b:不，这次由我付。 
    a:不，还是我来。 
    b:好吧，那就谢谢你啦?

    8) a: this lunch is on me today, 
    b: i think you got it last time. 
    a: it‘s my pleasure. 
    b: that‘s very nice of you.

    a:今天这顿饭算我请客。 
    b:我记得上回也是你请的。 
    a:我请得心里高兴。 
    b:既然这样，那就多谢了。