当孩子没有按时回家时，父母发出了警报。

The parents ___raise ___the ___alarm when their child doesn't return on time.

卫生官员迅速对这种新疾病发出了警告。

Health officials quickly ___raise ___the ___alarm about the new disease.

环保组织正试图就气候变化发出警告。

Environmental groups are trying to ___raise ___the ___alarm about climate change.