what后面加什么从句

　　例句：

　　What he said at the meeting was very important．

　　他在会上所说的非常重要。

　　What surprised us is that he did it alone．

　　使我们吃惊的是他一个人做了那项工作。

　　They stopped to see what was happening．

　　他们停下来看发生了什么事情。

　　The teacher got angry because of what the boy had done．

　　那个男孩子做的事情让老师很生气。