医生给了他关于药物副作用的警告。

The doctor gave him ___warnings about the side effects of the medication.

天气预报发布了暴雨警告。

The weather forecast issued ___warnings about heavy rain.

公司发出三次正式警告后，他因违反安全规定被解雇。

After three official ___warnings, he was fired for violating safety regulations.