Purdue scored 21 points in the first half and held on for a 21-14 win over 23rd-ranked Illinois.  Caleb TerBush passed for 178 yards and two touchdowns for the Boilermakers, who have won two-of-three to improve to 4-and-3 on the year.  Raheem Mostert had a 21-yard touchdown run in the victory.  Nate Scheelhaase threw for 217 yards and ran in for a score for the Illini, who have dropped two straight to fall to 6-and-2.  Jason Ford had 10 grabs for 83 yards and a score in the loss.  Purdue has won six of the last seven meetings between the Big Ten foes.