完形填空。阅读下面短文，掌握其大意，从每题所给的A、B、C、D四个选项中，选出最佳选项。【2011·全国卷】
There are times when people are so tired that they fall asleep almost anywhere. We can see there is a lot of sleeping on the bus or train on the __1__ home from work in the evenings. A man will be __2__ the newspaper, and seconds later it __3__ as if he is trying to __4__ it. Or he will fall asleep on the shoulder of the stranger __5__ next to him. __6__ place where unplanned short sleep __7__ is in the lecture hall where a student will start snoring (打鼾)so __8__that the professor has to ask another student to __9__ the sleeper awake.
