读一读，补全对话。
1. A: What are you doing?
B: I'm ____________ up leaves.
2. A: What is Sarah doing?
B: She's ____________ pictures.
3. A: What are John and Zhang Peng doing?
B: They're ____________ chess.
4. A: ____________ he counting insects?
B: No, he ____________.
5. A: ____________ are they?
B: They are ____________ the woods.
6. A: ____________ is Chen Jie?
B: She is ____________ the classroom.
7. A: ____________ they taking pictures?
B: No, they ____________.
8. A: ____________ you eating dinner?
B: Yes, ____________ are.
