our teacher prefers us to write the story of the next hour.
Well, my policy in school was always to rise to the occasion and do it the way the teacher prefers. Things go better that way!
Your strategy for getting ideas has a flaw. If I give you my idea, you won't be inspired about it like I am. What you need is not an idea, but inspiration. Look around you right now. Whatever is happening for you right now, whatever is important to you in this moment, write about it. That is your hour. Write about what is meaningful to you right now... is it the plane crash in Moscow? Is it Haiti? Is it the earth quake in China? You do not have to actually write about those things, but take the energy from what you feel strongly about and use it... write about what is happening for you right now.
And give yourself permission to lie. You can lie, an you can express ideas through symbols... write a story about an hour, and let that twist be something that expresses a feeling that is important to you.