Sorry, mom! I am late. The traffic is terrible today.–What a pity! Jenny ___ here to see you, she should be on her way home now.

I have _____ homework to do than you.

下列各句中“之”的用法不同于其他三句的一项是（      ）

of the danger in the street at night, she went home with a friend her.

Many families have their own cars. __________， it causes the terrible air problem.