It is such a difficult problem___nobody can work out.为什么要用as而不是that

To master English in such a short time is too difficult for him中的句子成份问题!To master English in such a short time is too difficult for him中的in such a short time 是状语还是定语?要是状语改成To master English is too difficu such ,a,it ,big, country,is.排序 Such a nice day it is.还是Such a nice day is it. It is such a fine weather .和It is such fine weather 哪个对 Chess,which more and more people are learning to play,is quite a difficu lt game.求翻译,要通顺 It is such a difficult problem___nobody can work out. How t___________ it is to do such a dangerous thing! It is nice ____(own) such a beatiful room. How（）it is to make such a mistake! It's such a tough road,and maybe life is 单项选择It is ___ bad weather todayA so a B such a C soD such It is a p___that Imissed such a good filmIt is a p___that I missed such a good film it is wonderful film that everyone enjoy it very much A such B such a C so D so a what a pity it is that in [ ] a big country there's [ ] forest.A;so,so manyB;such,such manyC;so,such littleD;such,so little she is such a it is not a good book (),but it has some interesting pictures.A.such asB.as suchC.such aD.a such为什么 What a beautiful painting it is!I have never seen ( ) painting.A .such a B.a C.such It is such difficult work that we can't finish it in a shout time.为何用such,不用such a 或者用so