对话填空 （满分10分）
请认真阅读下列对话，并根据各题所给的首字母的提示，在答题卡右栏中标有题目的横线上，写出一个英语单词的完整、正确的形式，使对话通顺。

--- Math department, Doctor Webster （76） s____.                                          --- Hello, Professor Webster, this is Janet Wang calling. I’m living next （77） t ____ your teaching assistant, Ken Williams, Ken asked me to call you （78） b_____ he has lost his voice and can’t talk to you （79） h____.             --- Lost his （80） v____? Oh, what a sham! Is there anything I can do for you?       --- Well, Ken has a class this afternoon from two thirty to four and he won’t be able to （81） t____ it, but he doesn’t want to cancel it either.                       --- Want me to try to find somebody else to teach the class? --- No, not （82） e_____. What he wants to do is to get someone to go in for him, just to pass back the mid-term exam papers. He’s already marked them and they are on the desk in his office. The whole thing wouldn’t （83） t____ more than ten minutes. --- His class （84） b____ at two thirty, eh? Well, I’m afraid at that time I’ll be on （85） c____ anyway, so I can do it for him.                                                                                       --- Thank you very much, Professor Webster.

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