English speech

All,

下个月公司组织英语演讲,经理帮我报名了.主题如下,有哪位帮忙指点一下,演讲内容讲些什么,非常感谢！
Topic: you could choose either of the following 2 topics:
a. The most creative thing I've ever done;
b. Make impossible possible;
我的e-mail:liuzhiming2008#126.com