根据对话内容，在空白处填入一个适当的句子，使对话完整、正确。 A:  Li Na, the summer vocation is coming. What are your plans? B:  I am going on a visit to Wuhan with my parents by train. A:  (1)________? B:  No, I haven't. I'll do it at once. C:  Hello! Enshi Railway Station. (2)________? B:  I'd like to book some tickets to Wuhan at 8:00a.m on July 1st. (3)________? C:  We have tickets at ￥145 for the hard sleeper and￥232 for the soft sleeper. Which kind do you want? B:  (4)________. C:  All right. Three soft sleeper tickets. Please pay for the tickets before 6:00a.m. (5)________? B:  Sure. I'm Li Na and my telephone number is 8410555. Thank you. C:  You're welcome.