Read and choose the best answer to complete the dialogue. Cathy: Hi, David! What’s up? David: Oh, not bad. What have you been doing recently, Cathy? Cathy: _________________.David: Where do you go to chat? Cathy: I usually use yahoo messenger. What about you? David: I’ve never chatted online before. Cathy: What? How is that possible? Why not? David: Well, my computer is really old, so most software isn’t compatible with it.