一道英语题(懂英语的请进）which is(are) right?1.The homework is too diffi

一道英语题(懂英语的请进）
which is(are) right?
1.The homework is too difficult for me to do it.
2.By the time they got to the cinema,the film had been over for one and a half hours.
3.How fun it is to play a game of football after work!
4.Helen had left her key in her office,so she had to wait until her husband would come home