Dice - General Questions

On a standard die, the numbers on opposite faces add up to 7. Which number is opposite 2?

On a standard die, which pair of numbers can never appear on adjacent faces?

Three positions of a die show (1, 2, 3), (1, 3, 6) and (1, 4, 6). Which number is opposite 3?

How many faces of a cube-shaped die are adjacent to any one face?

A cube painted red on all faces is cut into 27 equal smaller cubes. How many small cubes have exactly two red faces?