t, _______ one cause that leads to theproblem

下列各句中“之”字用法归类正确的一项是(　) ①齐楚之精英 ②杳不知其所之 ③秦人视之亦不甚惜 ④多于南亩之农夫⑤项伯乃夜驰之沛公军 ⑥欲人之无惑也难矣⑦师道之不传也久矣 ⑧夫晋，何厌之有⑨句读之不知

I think you should phone David， who is in charge of the project____， and apologize to him．—________! It was his fault．

We should respect food and think about the people who don’t have wehave here and treat food nicely

In 2009 many countries are going throughfinancial crisis，________hasa great effect on many walks of life.