1. A. Sorry, I don’t know. B. Certainly. Good idea. C. Sure. No problem.
2. A. Thanks a lot. B. I’m really tired. C. I’m not feeling well.
3. A. I’m sorry to hear that. B. What’s wrong? C. I’m afraid not.
4. A. Is that so? B. OK, I will. C. Yes, I think so.
5. A. Who are you? B. Hold on, please. C. Yes, you can.
