Ⅰ.阅读下面材料，在空白处填入适当的内容(1个单词)。
1．He was in the mountain for a year. He felt as if he was cut ________ from the outside world.
2．There is no point arguing about what led ________ the accident. I’d rather you focused ________ the victims of it.
3．At the meeting, the old man came up ________ some good advice and all the people there agreed with them.
