[解析]
76.D 根据回答"Sure."再结合An interviewer is interviewing a Chinese student who is studying in America联系全文可知,此处的意思为:我能问你一些问题吗?故选D.May I ask you some questions?
77.E 根据"How long have you been studying here?"可知这里的回答应为时间段,故答案为E.For about two years.
78.G 根据回答"I'm going back to China."可知,记者是在问他以后的打算,故选G.What are you going to do after finishing your study?
79.B 根据"China is developing faster and faster.中国发展越来越快"推测,这里应该与祖国有关,再结合选项故答案为B.And I want to do something for it.
80.A 根据"Thank you."可知,这里的记者应该在送祝福,故答案为A.Wish you a nice future!
[点评]
本题考查了"情境对话,补全对话",属于"综合题",根据上下文语境来确定句意,j结合语法结构得出正确答案是解题的关键。