A： Pele， how about playing basketball together this afternoon？
B：（1） ． I'm busy． Maybe another time．
A： What are you doing？
B： I'm（2） ． I must finish it on time．
A： What plan？ Is it very important？
B： Yes． It's about（3） ．
A： What kind of volunteer work do you do？
B： I help out at the old people's home and I organize some activities．
A：（4） ． Can I join you？
B：（5） ．