he was falling ____(sleep) when he geard a knock at the door

he was falling ____(sleep) when he geard a knock at the door He was sleeping when there was a loud knock at the door.[对sl while he was reading the letter,he heard a knock at the door when he heard a knock at the door ,he went _____ quickly When he heard a knock at the door,he went ___ quickly. He was just falling asleep when someone knocked at the door. 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 When the old man was alive,he ____ sit for hours at the door 英语分析,he heard a knock at the door .he 是主语,heard 是谓语,a knock Please ____(knock)at the door when you come in. The Greens （）（have）supper when there was a knock at the door