阅读下面材料，在空白处填入适当的内容（1个单词）或括号内单词的正确形式。
One sentence from the news in Washington has remained in my mind since a trip last summer: “When you see people run againstthe crowd escaping       the danger, they are   (probable) firefighters, police or journalists.”
I think this is most true for the firefighters. Whenever and wherever      (disaster) happen — 9/11 Attacks in New York 14 years ago or the explosion in Tianjin on Wednesday night — it is always the firefighters       take the lead to run to the very center, saving lives by       (risk) their own. I cried today near the explosion site, not because of the smoke from the ongoing fire   because of a short message a firefighter sent to a trusted friend that went viral online. It reads, “If I cannot make it, my father is     (you) father; and please remember        (sweep) my mother’s tomb.” I was thrilled later to learn that he did make it.
“Everyone knows it’s       (danger) to be a firefighter. But he has always liked it and has done it for 12 years,” his father said. “He survived this time, but no one knows what     (happen) next time.”