1.The shop sell,clean and repairs hearing aids.
2.The old man said nothing (or The old man says ,"It's not necessary to shout when you're speaking to me.My ears are as good as yours.This hearing aid is my wife's,not mine.I have got a throat operation.I can hear very well,but I can't speak.")
3.Because he wants to get the hearing aid repaired.
4.He can't speak
5.The old man's wife