Fezziwig was Scrooge's master, not his teacher. Fezziwig was Scrooge's employer when Scrooge was a young man learning the trade of business.
Christmas
Scrooge finally realizes the ghost is showing him his future when he sees the scene of his own death in "A Christmas Carol" by Charles Dickens.
Scrooge's partner, Marley, was dragging long chains with him as his punishment for being so evil throughout his life.
A bright light emulating from beneath the door of the next room
Scrooge liked Fezziwig because he was very generous, and respectful to his co-workers. Also, everybody loved him.
The schoolmaster from "A Christmas Carol" is a minor character who appears in the novel during a Christmas party thrown by Ebenezer Scrooge's nephew Fred. He is described as being lively and full of holiday spirit.
Scrooge was scared by the sight of the tombstone because it bore his name, indicating that it was a glimpse of his own future death. This sight made him realize the consequences of his mean and selfish behavior, stirring feelings of fear and regret within him.
He is transported around each of the scenes the ghost wants Scrooge to experience without being seen
No. To quote from the story itself (with respect to Scrooge's lodgings): "It was old enough now, and dreary enough, for no one lived in it but Scrooge, the other rooms being all let out as offices."
Both "realise" and "realize" are acceptable spellings, with "realize" being the preferred spelling in American English, and "realise" being the preferred spelling in British English.
Scrooge realizes he is witnessing the aftermath of his own death when he sees people discussing the death of the person. He then sees his own body lying on the bed covered by a sheet, leading him to understand that he has passed away.