用it改写下列句子
【小题1】They seem to have finished their work.
__________________________________________________________________
【小题2】Whether the language of English will stay the same is not difficult to answer.
__________________________________________________________________
【小题3】Crying over spilt milk is no use.
__________________________________________________________________
【小题4】To protect the environment is everybody’s duty.
__________________________________________________________________
【小题5】He found to study the economic situation in Russia was important to his paper.
__________________________________________________________________
【小题6】Though very shy as a child, he eventually turned out to be a leader.
__________________________________________________________________