Which questions should a writer ask when revising an argumentative essay to make sure it is in a formal style?

check all that apply.
are my ideas logically connected?
are my arguments well organized?
do i avoid a casual style and tone?
where can i insert some contractions?
which wording should be more colorful?

The answers are:

Are my ideas logically connected?

Are my arguments well organized?

Do I avoid a casual style and tone?

An argumentative essay, like any other piece of formal writing, should try to avoid a casual tone, sticking instead to a formal tone; that is to say, a form of expression that is concise, accurate, meaningful, and avoids the ambiguities of a casual tone. A final revision should also contemplate the first two answers, and one of the best ways to do this is to read the essay aloud or have someone read it aloud since listening, rather than reading, can more clearly reveal if the ideas are logically connected and well organized.  

#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 : )