3 pairs
Three.
A cuboid has 3 pairs of parallel faces.
Three.
two.
3 pairs
3 pairs
Three.
A cuboid has 3 pairs of parallel faces.
Three.
Three pairs.
two.
12
3 pairs of parallel faces
There are 257 topologically different convex octahedra. Many of these will have no parallel faces. It can have four pairs of parallel faces.
The answer will depend on whether you mean parallel edges or parallel faces.
I'm pretty sure it is 12 pairs of parallel lines.