In the book 1984, part 2 Thinking about the intruder in the room above Charrington’s shop, what significance does this interloper have?

yes the first one is correct .

the pronoun reference replaces a noun, but you have to make sure there's no room for confusion.

in the first sentence "her" could be referring to shely or to the sister. the answer there is "shelly called her sister and told her about the new baby."

in the second sentence "it" could be referring to the roof or the floor. the answer there is "since the roof leaks on the family room floor, we need to repair the roof."

" animal is healthy and eternally gratefully that you provided him with a warm home." and "the health and well-being of our animal friends is what is at stake here."

i think its descriptve symbols but im not sure