选择合适的句子完成对话.
1.I'm afraid I can't.
2.She was ill yestday.
3.I hope she will be better soon.
4.What are you going to do this morning?
5.Would you like to join us?
6.How are you todauy?
A:Hello,Sam.
B:Hello,Linda.
A:___________
B:Nothing.Why?
A:There will be a dolphin this afternoon.Mike and I are going to watch it.____________
B:_____________I nust look after mum.
A:Oh,what 's the matter with you?
B:_______________.
A:I'm sorry to hear that._____________