No one knocked upon the door to see if he was hurt.

My hours are limited: I expect any moment that knock upon the door.

They halted, and the policeman knocked softly upon the door immediately before them.

He walked right up the path and knocked upon the door.

Thus, the wolf ran quickly down the road of needles and knocked upon the door to the girl's mother's cottage.

Knocking upon the door, she heard her mother call out in a strange voice, "who's at the door?"

He stepped over the guards and knocked upon the heavy wooden door.

Waco had been reading when someone knocked upon the door to his van.

"So much the more in the old sock," reflected the nephew, as he knocked upon the door.

"Yet we must knock upon the door if it is to be opened to us!"