There was a stanger (stand)_at the door

there was a knock on the door. The teacher had John _at the door for an hour beacuse he was i found a dog （）near the door A、was standing B、to stand C、st 1.S_____ there was a knock on the door. stand in the door There was a knock at the door.It was the second time someone the door was open and there was a sound from ＿ a. Getting there,the door was found opened. He was about to go to bed ____ there was a knock on the door ____ I was falling asleep,there was a loud knock on the door He was just __ __ when there was a loud __ __ the door. He was sleeping when there was a loud knock at the door.[对sl