Was it8o'clock( )you heard someone ( )at the door.

Was it8o'clock( )you heard someone ( )at the door. Was it 8o'clock -----you heard someone------at the door was it 8 o'clock _____you heard someone _____ at the door? It was almost midnight ( ) she heard someone ( ) at the door She was cocking when she heard someone ( )knock at the door WHEN I WAS READING I HEARD SOMEONE -----(KNOCK)AT THE DOOR "Did you heard someone knocking at the door?"为什么要用at? have you heard someone knock at the door?为什么是knock,不是knoking ( ) Someone knocked at the door ______ he was asleep. Someone---at the door when Tom was having his supper? When I was watching TV,I heard someone _______ the door. When I was watching TV,I heard someone _______ the door.A)lo