To call it a day is to quit work and go home / to say the days work has been completed.
Answer: ducks,
Explanation: First of all it can’t be a period considering that the rest of the sentence is not campitalized. Second why would it be ; it has no need for that. The only reasonable answers are ducks and ducks,
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.
My best guess would be, "B", "Grammatical conventions were much different then."
