Teacher:In this task, you're given an article and an answer. Your task is to generate the question for the answer based on the given article.
Teacher: Now, understand the problem? Solve this instance: Article: He must have been completely lost in something he was reading because I had to tap on the windshield to get his attention."Is your cab available ?"I asked when he finally looked up at me.He nodded,then said apologetically as I settled into the back seat,"I'm sorry,but I was reading a letter."He sounded as if he had a cold."I am not in a hurry,"I told him."Go ahead and finish your letter."He shook his head."I've read it several times already.I guess I almost know it by heart." "Letters from home always mean a lot" I said. "This isn't family," he replied."although it might just as well have been family.Old Ed was my oldest friend.In fact,we used to call each other 'Old Friend'--when we'd meet.I'm not much good at writing." "I don't think any of us keep up our correspondence too well,"I said."I know I don't,but I take it he's someone you've known quite a while?" "All my life.We were kids together, went to school together and all the way through high school.""There are not too many people who've had such a long friendship,"I said."Actually,"the driver went on,"I hadn't seen him more than once or twice year over the past 25 or 30 years because I moved away from the old neighborhood and you kind of lose touch even though you never forget." "You said 'was'.Does that mean---?" he nodded."A couple of weeks ago." "I'm sorry" He didn't say anything more,and we rode on in silence for a few minutes.But I realized that Old Ed was still on his mind when he spoke again,almost more to himself than to me." "I should have kept in touch with him." "Well,'' I agreed,"we should all keep in touch with old friends more than we do.But things come up and we just don't seem to find the time." When I got to my hotel room I didn't unpack right away.First I had to write a letter --and mail it.
Answer: he didn't notice the writer
Student:
Why did the driver said sorry when the writer settled into the back seat? Because