Power can corrupt anyone would be the correct answer.
They are essential because they add feeling and the character expresses feeling when reading them.
It is so dark that they will lose their way,,They can not carry all the gold by themselves,,He is waiting for Huck so he can give him his share,,He won't leave until he steals all the girls' property.
These ones are the choices
Explanation:
1) described
2) would have
3) mustn't cross
4) didn't know
5) not grammatically correct
6) wouldn't forget
7) was leaving
8) hadn't bought
9) would come
10) had written
11) to close
12) not to be late