If a word is capitalized in the middle of a properly written sentence, chances are the word is

a. a grammatical error b. the most important word in the sentence c. a proper noun
d. the start of a definition

#1  sara was always tasked with selecting birthday presents for her friends and family because everyone admired her  impeccable taste. 

impeccable (adj): perfect, flawless

#2  they moved to the united states many years ago, but their  insular  attitudes made it difficult for them to socialize. 

insular (adj): isolated; separate

#3  the professor explained the  semantic  relationship between the two nouns used in the sentence. 

semantic (adj): related to words or the meanings of words 

happy to : )

what is the book idiot with the brocken tester