12
I'm pretty sure it is 12 pairs of parallel lines.
3 sets of four mutually parallel lines.
Yes: three sets of four.
A cuboid has 3 quartets of parallel lines. Each quartet gives rise to six pairs. So, in all there are 18 pairs of parallel lines.
4 parallel edges
Three sets of four each.
2
Yes, a cuboid does have parallel edges. In a cuboid, all pairs of opposite edges are parallel to each other. Additionally, the opposite faces of a cuboid are also parallel to each other.
3 pairs
3 pairs
Three.