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Hints：
Rachael
Dr. Richardson
Come in, Rachael. I was told that you wanted to talk to me about your term paper. Yes? Yes, Dr. Richardson. I want your opinions on what I intend to write. I'm planning to write the paper on the comparison and contrast between TV commercials at different hours of the day. What do you think of this subject? It's very good. Have you considered how many time periods you want to talk about? Well, I think I would consider all of them. And that's five time periods: the morning commercials, the mid-morning ones and the midday ones. Besides, there're eight o'clock, ten o'clock and midnight commercials. Oh, that's six, not five. Er, that's too many. Why don't you just focus on two time periods, for example the midday commercials and the eight o'clock ones. Then you can concentrate your paper on the subject by comparing just two groups of audience.