看图，完成下列对话。
1.	A: What are they doing? B: They're__________.
2.	A: What is _______________? B: She's _________________.
3.	A: What ____________________? B: They're ___________________.
4.	A: What _____________________? B: ___________________________.

1. playing chess
2. she doing、picking up leaves
3. are they doing、having English class
4. is she doing、She's writing a report