Question 28 - 30 refer to following conversation:
M-Au: Excuse me. My mobile phone is out of power. Are there any tables here at the cafe that are near a wall socket, so I can charge my phone while I have some coffee?
W-Br: Well, we only have a few outlets. And... it looks like all the tables near them are occupied. I'm sorry about that.
M-Au: Hmm. In that case, can you suggest anywhere nearby where I might be able to sit for a few minutes and charge my phone, then?
W-Br: You know, the public library would be perfect for that, and it's just a block up the hill. You'll see it on the corner of Willow Street
28. What problem does the man mention?