I find this Math problem very ______. I believe students can work it out ______.

--- Now more people are paying attention to the school bus safety.  --- So we believe ________ there will be fewer accidents in the future. 

It’s ________ of Chen Guangbiao(陈光标) to donate 100,000,000 yuan to people in debris disaster areas(泥石流灾区) in Taiwan. I think he is one of the best philanthropists(慈善家) in the world.

He worked        , but he felt       .

___your school like?