Do you think you are responsible citizen? if so, why? if not, why?

That's ur point of view. I can't just say it randomly, but,

If u keep ur surroundings clean, do not litter everywhere, follow the rules and laws, do not break rules, etc then u r a responsible citizen & if u don't do these all then u aren't..

#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 : )