11.  Another juror found it amusing to knock on doors and disappear before it was answered.

12.  Because of problems raising cash, Mauro hit the streets early, embarking on a grassroots campaign of knocking on doors across Texas.

13.  A few weeks ago the National Retail Federation brought a group of its members to Washington to knock on doors.

14.  A family friend, Terri Rayne, helped Toni Lambert look for the cat, knocking on doors and distributing fliers near the wooded area where the wreck occurred.

15.  But danger has never stopped journalists from knocking on doors.

16.  But they are knocking on doors at the office, not at home.

17.  But when she began knocking on doors of potential investors last February, she immediately met with frustration.

18.  Candidates are walking and knocking on doors.

19.  By day, he knocked on doors of dusty warehouses where the new tinkerers were at work, offering loans against government contract receipts instead of personal collateral.

20.  Even as Keri Amrhein knocked on doors, handing out fliers Saturday morning, she wondered if her effort would make a difference.