但当我到那儿时，学校是空的。

But when I got there, the school was empty.

将吹起的气球放在一个空碗里。

Place the blown-up balloon in an empty bowl.

每次她把空罐子放在桌子上，它都会装满。

Each time she put the empty jug on the table it filled up.

在中国，用筷子敲空碗是不礼貌的。

In China, it's impolite to use your chopsticks to hit an empty bowl.

“在那里，安娜，”老师指着一个空椅子回答。

"Over there, Anna," replied the teacher, pointing at an empty chair.