1 6, opposite, 12, opposite, 8. 6,6, 12,12,8, length, width, height, length, width, height, cuboid, cube, 2, (1) 8cm, 6cm, 96cm, 8cm, 5cm, 80cm. (2)6 cm, 36 cm2, 5,265,438+06 cm2. 3. Length, width and height. Side length, side length, side length, a×a×a, Height, sh.4, cm, decimeter, meter, 10. Square centimeter, square decimeter, square meter, 100. Cubic centimeter, cubic decimeter, cubic meter, 1000. ML, liter, 1000. 5, 1000, 1000, 6,5 decimeters long, 4 decimeters wide, 7-5 = 2 decimeters high, surface area: (5×4+5×2+4×2)×2=76 (square decimeter).