补全对话，将句子的字母编号写在横线上。
         Linda and David are in the classroom.

Linda: What are you doing, David?

David: It's for Earth Day.

Linda: When is Earth Day?

David:

Linda: What do people do on Earth Day?

David: Such as pick up rubbish and recycle paper.

Linda: That's wonderful!

David: You can make a poster.

Linda: Yes. And I can draw some signs on it.

David: Great!

A. It's on 22nd April every year. B. I'm drawing a picture. C. What can I do for Earth Day? D. I'm good at drawing. E. They do something good for the Earth.