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）　　．