有一天，我回家发现我的窗户被打碎了。

___One ___day, I came home to find my windows smashed.

有一天，我正在读一本有趣的书，突然有人叫我。

___One ___day, I was reading an interesting book when someone called me.

有一天，我在街上发现了一只迷路的小狗。

___One ___day, I found a lost puppy on the street.