What do you do in your spare time?  

你业余时间干什么？

Jim：

I enjoy reading alone at home. How about you?  

我喜欢一个在家里读书，你呢？

Mary：

I like swimming very much so I spend much of my spare time in swimming pools.  

我特别喜欢游泳，大部分业余时间都泡在游泳池里了。

Jim：

Then you must be in good health.  

那你的身体肯定特棒。

Mary：

Yes. I think if you are free you should take part in some sports. It will do you good.  

是的，我想你如果有时间的话应该参加点体育运动，对你有好处。