那响亮的哔哔声是火警警报，警告所有人离开大楼。

The loud beeping sound was the fire ___alarm, warning everyone to leave the building.

是什么触发了警报？

What set off the ___alarm?

当厨房的烟雾报警器响起时，我们迅速打开了窗户。

When the smoke ___alarm went off in the kitchen, we quickly opened the windows.