Choose the word that BEST completes the sentence. Dad usually supported my music ambitions, but sometimes he seemed irritated, as if my saxophone
produced a sound.
unfamiliar
suitable
grating
perplexing

grating

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."