What are the classes of airlines?​

What sign post goes with the quote goodnight goodnight parting is such sweet sorrow. that i shall say goodnight till it be morrow

Pls, i really need on this question?

Why is it important to be aware of you audience's interests? a. so that you can teach them new information thy didn't know b. so that you can use opposite ideas in order to shock them c. so that you can use the most effective strategy to persuade them d. so that you can pretend to like the same things and get them to trust you