Directions: The following is an invitation letter. After reading it, you are required to complete the outline below it(No. 46 through No. 50). You should write your answers briefly(in no more than 3 words). Dear Professor Mike Whitney, We are very glad to hear that you are attending an international conference in Beijing. We are writing this letter to inquiry the possibility of inviting you to deliver a lecture on American literature for our postgraduate students on the evening of March 15. We have long been noticed that you have done a lot of substantial and creative work in this field. Two of your books have become textbooks for our students for several years. So all of us believe your lecture will benefit our students and teaching staff alike. If you can manage to come, please tell US the number of your flight and we will meet you at the airport. If you can’t make it, please also let us know. We are looking forward to your coming. Sincerely yours, Xie Li Invitation People invited: (46) . Information about the professor: 1. Professor Whitney has done a lot of creative job in (47) field. 2. Two of his books have become (48) for students. 3. He is attending an (49) in Beijing. The purpose of the invitation: to give a lecture for (50) on the evening of March 15.