把下列句子改为it作形式作主语的句子.
把下列句子改为it作形式作主语的句子.
1、to learn skating will take a small child less time.
2、learning without thinking is of no use.
3、whether they'll go or not hasn't been decided.
4、some people say that 50 people died in the earthquake.
5、where we shall hold the meeting doesn't matter.
6、we should protect ourselves against AIDS.This is very important.
7、people are likely to die it they are infected with HIV.
8、crying over spilt milk is not useful.
9、I find to quit smoking is not easy,especially when you are mentally addicted to it.
10、he is so brave,for he rescued the child at the risk of his own life.