When determining if a book provides good coverage of a topic, readers are assessing the appropriateness of the content of the book.
if they are interested in the content of the book.
the appropriateness of the complexity of the book.
if they are selecting the book for the right purpose.

The appropriateness of the content of the book

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."

well easy, ask her if she's free or if she would like to go out with you.

explanation: