补全对话。根据下面的对话情景，在每个空白处填上一个适当的句子，使对话的意思连贯、完整。 A：Hi, Tina. What are you going to do this weekend? B： 1 A：A concert？What kind of concert is it? B：A piano concert. It is held for charity. A： 2 B：Yes, there are many famous musicians, such as Li Yundi, a well-known Chinese pianist. 3 A：Certainly, I'd like to. Li Yundi is my favorite musician. 4 B：120 yuan. A：Oh, it's too dear. I can't afford it. B：I don't have so much money, either. I plan to sell newspaper to r