Smug is the answer. Gloat means to celebrate one's misfortune with smugness. Hope this helps :)
In my opinion, they do not only reveal what will happen, but also manipulate events. When Macbeth approached the witches, they could have concealed the truth from him and just let the events unfold, but they didn't do it. They told him about the prophecy, thus initiating the events that soon followed. If they hadn't told him the truth, Macbeth might have never killed Banquo, Duncan, and the rest in order to become king. So yes, they manipulated events and caused a great tragedy.
It was finally D-day. We were super excited to be visiting the 'R-Zoo' as it was called ('R' for Radioactive). The zoo was the only one of its kind, with its main attraction being its extremely fierce radioactive alligator. That is precisely where we were headed first. As soon as we entered the somewhat dimly lit cavern, we could hear a roar from the crowd, with a preceding crackling sound, something that resembled a burst of lightning and the sharp wham of something very heavy falling onto the ground. It was a huge banyan tree that was lying horizontally at the edge of the water. At first, we didn't notice anything much except the brown wooden log and the glistening water. It was only when the log started moving that we could make out <em>what</em> was moving it - a huge, menacing, scaly creature with jaws powerful enough to hurl the heavy tree out of the water, laser-like eyes glinting with anger at probably being disturbed out of its reverie, and a body that seemed to be emitting sparks at regular intervals, igniting the dry leaves that came in its way.
An exposition is a settling fourth of meaning or intent
