听下面一段材料，回答1-3题。 1.When does this conversation take place? A. At the beginning of the term. B. At the end of the school year. C. In the middle of the summer vacation. 2.Where do Bob and Ellen want to go? A. To a movie at the student center. B. To an opera at a concert hall. C. To a popular music concert. 3.What are they going to do first? A. To buy two tickets. B. To have supper. C. To go to the concert.