1．It wasn’t until I had a heart valve replacement that I decided to lead an active life. (完形填空第一段)
直到我换了心脏瓣膜我才决定过一个积极的生活。
(1)It is only when one is ill that one realizes the value of heath.
人们生病了才知道健康的价值。
(2)It was because the water had risen that they could not cross the river.
正是因为水涨了，他们没有渡过河去。
