41. A second " closed " position is needed to block off water from the reaction. 42. It took three hours to get that block off . 43. "Tyson can knock anybody's block off if he connects. 44. Sullivan led a column of men to block off escape of troops across the creek. 45. They then used the stones to block off the doors, and pelted police with rocks. 46. He's going to knock your block off ." 47. Campbell has promised to arrest lawbreakers, impound their cars and block off streets during the weekend. 48. Their job has been to block off streets during funerals for some of the lost firemen. 49. Statoil is handling drilling operation at four exploration blocks off Nigeria on behalf of its partners. 50. The volunteers set flares to warn motorists and used yellow tape to block off the lane.
