用适当的短语、句子补全对话。 A: Hi, Mike! Could you please play pingpong with me? B: 1 . A: Why? B: I have to stay at home 2 my granny. A: 3 ? B: She said she had a cold. A: 4 . Did she go to see doctor? B: Yes, I took her to the hospital this morning. A: 5 ? B: He said there was nothing serious with my granny, but she has to be in bed for some time. A: Are you coming later? B: I'll if I can. I have to wait until my mother comes back. A: OK. But now I have to ask Li Hua instead. 1._______________________ 2._______________________ 3._______________________ 4._______________________ 5._______________________