41.  Officers knocked on doors and talked to residents.

42.  On Labor Day, Wallace will begin touring suburban neighborhoods, knocking on doors, giving out green-and-white Celtics nets and answering questions from fans.

43.  Other times they would knock on doors, offering to do household chores.

44.  Ortiz, with the assistance of the Espadas, assembled hundreds of volunteers, who knocked on doors and distributed literature for weeks.

45.  Presidential candidates pass through, knocking on doors, attending their pancake dinners.

46.  She is persistent, knocking on doors each week.

47.  Sheepskin in hand, I began knocking on doors.

48.  Six years ago, Hutchison was asleep on the living room couch when someone knocked on the door.

49.  So he still knocks on doors and makes phone calls.

50.  So off they went, knocking on doors of banks and private investors.