How do the words “witnesses” and “shocked” change the tone of the statement

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."

birdman is the worse rapper in history

based on the graph, people who are asian/ pacific islander, are better at math than the other race/ethnicity's on the graph.