1. b             

2. c             

3. d            

4. a

Transcript:

1. A: Look at Peter. What’s he doing?

B: He is putting up a tent.

2. A: What’s Linda doing?

B: She is singing songs.

3. A: What’s Nam doing?

B: He’s telling a story.

4. A: What are Mai and Linh doing?

B: They are dancing around the campfire.