题目：
| 看图补全对话。 | |
1. | A: What are they _________? B:They are _________． |
2. | A: Are they _______ ? B: Yes, they are. |
3. | A: _________ your birthday? B: It's May 1st. |
4. | A: What is John doing? B: He's ________. |
答案：
1. doing、playing chess 2. having a picnic 3. When is 4. catching butterflies
