The good guy stood on a high point of land overlooking the body of water
protagonist on a promontory

The Bulgy Bear
The guards were scared in the presence of the bad guy
sentinel, tremulous, antagonist

Glenstorm the centaur
The event was as boring as a pile of rich brown dirt
tedious, loam, simile

Pattertwig the squirrel
What does the captured person think the children are?
Ghosts
Whose arrival interrupted Caspian's speech at the Dancing Lawn feast?
Doctor Cornelius
List two of the three marshals selected for the challenge against Miraz.
the Bear, Giant Wimbleweather, and Centaur Glenstorm
The reddish stinging hairs of a plant were daggers cutting into their hands
metaphor, crimson, nettles

Fauns
How many steps were there going down to the treasure chamber?
16
What does Cornelius say that he and Caspian are going up the tower to see?
a conjunction of two noble planets, Tarva and Alambil
What do all of the mice start to do when Aslan refuses to resore Reepicheep's tail and why?
They begin to cut off their own tails, because they won't have such an honor if it is denied their leader.
His face was serious when he came in after the 1st place person by 1/60th of a minute
Solemn, countenance, homograph (second and second)

The trees eat loam (and Edmund too)