"(Before) I came out,"one said,"I ran into some of the rooms

"(Before) I came out,"one said,"I ran into some of the rooms and found a lot of money.People don't think of money when they are (afraid).When anyone leaves paper money in the fire,the fire (burns) it.So I took all the bills that I could find.No one will become poorer
(b ) I took them."
括号中的题目是空缺的填词题,以b打头的词应该填哪个比较合适,请给建议,
除了because有更好的答案吗?