Answer:
We were at a disadvantage <em><u>in</u></em><em> </em>that that we weren't too familiar with the language the others were using.
Explanation:
In the given sentence, the correct preposition to be used is "in". This is because "in" will introduce the argument or provide an explanation for the statement before the blank.
With the use of "in", the statement <em>"we weren't too familiar with the language the others were using"</em> provides an explanation for the first statement <em>"[W]e were at a disadvantage"</em>. Whereas the use of the prepositions "by", "with", and "for" are incorrect.
Thus, the correct answer is "in".
That depends on what kind of essay we are talking about. If you are talking about a persuasive essay, then use different appeals and techniques, like ethos, logos,pathos, facts and figures, or testimonial. If we're talking about a narrative essay, then use plenty of imagery and sensory details, plus make sure to have plenty of characterization for your dynamic characters.
It is the brainstorming phase. In this step, you decide your topic or subject and the purpose of you writing it as well as who your audience will be.