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1·I was wakened by a knock at the door.

敲门声把我吵醒了。《牛津词典》

2·They heard a knock at the front door.

他们听到前门有一敲门声。《柯林斯英汉双解大词典》

3·They were interrupted by a knock at the door.

他们被敲门声打断了。《牛津词典》

4·Late that evening, there was a knock at the door.

那天深夜，有人敲过门。《牛津词典》

5·I'm sure luck will knock at your door!

我相信幸运会敲你的门！

6·There came a crazy knock at the doctor's office door.

医生办公室传来一阵疯狂的敲门声。

7·You're supposed to knock at the door and wait before entering the office.

进办公室之前，你应该先敲门然后等着。

8·There was a knock at the door.

门外传来敲门声。

9·Suddenly there was another knock at the door.

突然，又有人敲门。

10·Who would knock at his own door if he was staying alone?

如果一个人呆着，谁会去敲自己的门呢？