giving a talk to a large group of people, the same talk I__________ to half a dozen other groups

What a woman! I just wonder how she managed to keep smiling after all that she had ________.

依次填入下列各句横线处的成语，最恰当的一组是 （ ）①消防工作必须立足于_____，从提高公众的防火意识做起。②即使现有的产品杨销，也要_____，抓紧技术储备与新产品开发。③如果我们不从小事做起，_____，那些细小的苗头最终可能酿成大祸。

According to new research, _____ we cook and eat food reflects the way that we treat life in a way.

He studies the subject _____