她把钥匙放在门口的碗里。

She put her ___keys in the bowl by the door.

良好的沟通是成功合作的关键。

Good communication is the ___key to successful teamwork.

钢琴上的黑白键被称为琴键。

The black and white buttons on a piano are called ___keys.

我忘记带练习册的钥匙了。

I forgot to bring the ___key to the workbook exercises.