Submitted would be a word in past tense because it ends in -ed
santiago built a display case for the crystal
The correct answer would be 1,2,3,6. Interacting properly with the multimedia content is important in order to use to full potential otherwise it can distract your audience and take the focus of your topic. Standing up straight and using appropriate is important in order to look confident and not to antagonize the audience by being too loud or too quiet. Also be mindful of the pace, you don't want to have to rush it.
False a pronoun takes the place of a noun. they are to be used so we don't have to refer to the same noun over and over again
