alarm

是什么触发了警报？

What set off the ___alarm?

当闹钟开始响时，我醒了过来。

I woke up when the ___alarm started to ring.

烟雾警报器能在火灾中挽救你的生命。

A smoke ___alarm can save your life in a fire.

我的闹钟每天早上六点响。

My ___alarm goes off every morning at 6:00 AM.