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what引导的从句在句子中的成分：
例1.作主语
After Yang Liwei succeeded in circling the earth, what our astronauts desire to do is walk in space.
It is pretty well understood what controls the flow of carbon dioxide in and out the atmosphere today.
例2.作宾语
I think Father would like to know what I've been up to so far, so I decided to send him a quick note.
Our hometown has changed a lot, and now it is quite different from what it used to be a few years ago.
A modern city has been set up in what was a wasteland ten years ago.
例3.作表语
Are you still thinking about yesterday's game?
Oh, that's what makes me feel excited.