Because he was as a child, rob was a rather self-centered teenager. after hearing the raucous, cheering response to adam’s speech, mr. james feared that his new student body president might be an amateur .

feel very well should be good

sentence lenght varies according to word choice.you select which word to use and that will require to use other expressions that collocate with the word chosen.sentence length will vary   according to the choice of words you make to express your ideas.  

i think ethier way not sure