Earth- tremor.. fear sucks as a multiboxer
Air- windfury (get some haste going on for the paladin)
Fire-Flamtounge
Water-Mana

Earth(2)- Stoneskin some more protection so you guys dont die
Air(2)- Wrath of the air (increased speed for shamans)
Fire(2)- Searing or magma (magma if all close, because great aoe damage)
Water(2)-Mana