帮忙把这4个英语句子变成被动语态

1.The runners exercised a lot.They took part in the 2008 Olympic Games.
2.We went back to the market.The old man left.
3.Richard ate all the cakes.His mother arrived home.
4.My father looked up a lot of information.He went to tibet.

好无聊的作业!
有必要改吗?
只有第3句还有改头,其它改变毫无意义,也无法改。

3.All the cakes were eaten when his mother arrived home.

第4句前部分可以改，但如果跟后部分相连，也无意义。

4. A lot of information was looked up... （晕！什么玩意？）

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