将下列句子转换为含it 的句子1,the distance from here to the post office i

将下列句子转换为含it 的句子
1,the distance from here to the post office is 10 kilometers
2,trying to talk to her when she is in amood is awaste of time
3,the time for him to go to bed has come now
4,10 years has passed since the family settled down in this village