用it改写下列句子
问题描述：
用it改写下列句子
1、His sister invited him to stay a little longer.That was kind of her.2、You couldn't pass the final exam.That was a pity.3、To walk in the beautiful garden is relaxing.4、To go hiking on the Great Wall is possible.5、To speak English as mnch as possible is very important for you.
答
1. It was kind of her sister to invite him to stay a little longer.
2. It was a pity that you couldn't pass the final exam.
3. It is relaxing to walk in the beautiful garden.
4. It is possible to go hiking on the Great Wall.
5. It is very important for you to speak English as much as possible.