The correct answer is:
On the other hand.
"He looked forward to visiting with old friends. Greta, on the other hand, dreaded seeing her old boyfriend."
This phrase is showing Greta and Fred are having different feelings in that moment, creating a contrast between both of them.
Answer:
1) solid 2) Water to steam - Water is vaporized when it is boiled on the stove to cook some pasta, and much of it forms into a thick steam. Water evaporates - Water evaporates from a puddle or a pool during a hot summer's day.
The introductory paragraph
The answer is Infrastructure attacks, information attacks, technological facilitation, and promotion.