1 . The school is warned to take p_________against fire.

2 . The school is warned to take ________ (precaution) against fire. （所给词的适当形式填空）

3 . It’s vital to take safety p________（预防措施）when working with electricity because even a small mistake can create short circuits that lead to a fire.  (根据汉语提示单词拼写)