It is _________ difficult work that we can't finish it in a short time.

—What _____ weather! We can’t go boating today.—I’m afraid we have to watch TV at home.

--What do you think of maths?--My favorite. It’s ______ for me to study of all the subjects in school.

—Mummy, can I ride your new motor bike to school?—Sorry, dear! You are too _________ to do that.

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.