1 The people on the tour thought that "the ghost" was part of the tour and his appearance had been planned before.
2 Yes, the story starts in an appropriate way. The prompt sentence isn't changed.
3 a) had decided to take..., had been chatting.., had been on the afternoon tour...had decided to make...
b) She was telling them..., was calling the local police
c) The tour started out... until they made
... someone screamed and everyone ran
approached.. realised
The police came, spoke... and arrested
d) had been chatting
4 The writer's style is informal. He/she uses informal / colloquial phrases, such as "make one's way", "to be about to", "spooky"
