1 . 她花了好长时间从心脏手术中恢复过来。(it做形式主语，recover) (汉译英)

2 . 正是他的决心使他取得了成功。
It was ________ ________ that led to his success.

3 . 黑暗中，如果妻子和丈夫走散，父母和孩子分开，再见面将是毫无希望。
If, in the darkness, wife was separated from husband, ________ ________ from________, there was no hope of________ meeting again.

4 . 令我们感到欣慰的是，失踪的孩子十天后回到了家。他虽然很累，但很健康。
________ ________ ________，the missing child returned home ten days later, tired but healthy.