1) 见面问候语:Good morning / afternoon, dear professors. I am XXX. (Nice to meet you.)。告别用语:Thanks for your time. / Thank you for giving such a chance. I hope to see you again and soon.
5) 意外情况——没听清,你应该怎样要求老师再说一遍(Pardon?/ Sorry, I can‘t follow you. / Sorry, I lost you. Can you repeat that question again?);需要时间思考、整理思路的时候,不要出现沉默,可以用一些hmm, err, well等语气词;不会回答某些问题时,千万不要不懂装懂,可以明确地告诉老师你不知道(Sorry, but I have no idea about it.)。