Everyone knows that _______ is dangerous to play with fire,b

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Everyone knows that _______ is dangerous to play with fire,but _______ is difficult is to prevent children from playing with fire.
A.it,it B.what,what
C.it,what D.what,it
为什么 it和what 有什么用法区别吗?
I hate _______ if people say such things in public
A.that B.those C.it D.them

第一句选C.
Everyone knows的宾语从句that it is dangerous to play with fire中it是形式主语,to play with fire是真正主语.
but并列的后一句what is difficult is to prevent children from playing with fire中
what is difficult是句子里的主语从句,主语从句_______ is difficult缺主语指事物,故用what.
第二句选C.
take,hide,put,appreciate等动词以及一些表示爱好的动词（like,love,enjoy,hate,can’t stand等）之后不能直接接宾语从句,用形式宾语it后可直接跟宾语从句.
I take it that he's not interested in the book.我猜想他对这本书不感兴趣.
She hid it that she was married.她隐瞒了她已婚的事实.
I don't like it when you look at me like that!我不喜欢那样看我.
I hate it when people speak with their mouths full of food.我讨厌人们满嘴食物讲话.
I would appreciate it if you could give me a hand.我会很感激你帮我.

1、Everyone knows that _____ is dangerous to play with f _______(play) with fire is very dangerous ___ with fire is dangerous.A.play B.playing C.played D.To pl Everyone knows fire is useful,_____it's also dangerous. You ------ play with fire .it is dangerous. It's dangerous to play with fire. It is dangerous to play with fire.为什么加with为什么play basketball _______(not play) with fire;it's dangerous It is dangerous for you to play with fire.()()()()is dangero To play with fire is dangerous .还可以写成什么形式? to play with fire is dangerous是不是没有这样的用法. tell the boy not to play with fire ,it is dangerous,为什么用not