A: Hey, Frank. Do you have a minute? I can't find the files I need on this hard drive, but I'm pretty sure I saved all of them here. Can you check what's going on for me?
B: Sure. Give me a sec. Geez, I'm afraid this hard drive is dead.
A: What?! This can't be happening! It's a brand-new hard drive. I just bought it last week.
（A）Do you have an iPhone charger? I forgot to charge my phone last night.
（B）My phone battery is dying. It says the battery level is 10 percent.
（C）Can you help me with the files? There are piles of them on my desk.
（D）I hope you backed up all the files because I don't think I can recover them for you.