1·Who knocks at this late hour?
这么晚了，是谁来敲门？
2·The Wolf knocks at the door.
大灰狼敲了敲门。
3·Opportunity knocks at every door.
良机会敲每个人的门。
4·Did you hear the knocks at the door?
你听到敲门声了吗？
5·He knocks at the door.
他敲了敲门。
6·Mr Green knocks at the headmaster's door.
格林先生敲了敲校长家的门。
7·President: Who knocks at the door of learning?
校长：谁在敲求知的大门？
8·One day, Mr Panda visits him. He knocks at his door.
一天，熊猫先生去看望他。他敲了敲门。
9·He knocks at the door as if he were master here already!
他敲门敲得好像他已经是这儿的主人了！
10·Please knock double knocks AT the door before entering.
请先敲两下门再进来。