选择合适的选项补全对话。
A: Hi! 1. ________?
B: I’m great. What are you doing here?
A: 2. ________. What about you?
B: I want to send a postcard to my friend.
A: Oh, I see.
B: Can you tell me how to write a postcard?
A: 3. ________! 4. ________. Then write what you want to say to your friend on the left. You should put the address on the right and 5. ________.
B: Oh, I see. Thank you very much.