为了全体学生的安全，学校每年都要组织一次“消防安全演练”，如果发生到火灾时，我们正好在室内，这时我们应该采取一些什么样的自救措施呢？哪些方法我们又不应采用呢，请根据提示发挥想象以How to Protect us from fire为题写一篇80词左右的短文，开头已给出，不计入总词数。
提示词：keep calm, call 119, turn off the gas and lights cover face, and leave the building, take the lift jump off
If a fire happens suddenly when we are in the room. We must do the following things: ______
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