Today at school, I had a suprise test about stories.

It was a lesson about imagination.
I invented a story the title of which was, 'The orphan and the Frog'. 
The orphan was mistreated by the cook at the orphanage. 
When she went to the market to buy fruit and vegetables for him,  she found a scarf and know he had flown. She got lost, found a talking frog...

In school

Hello ,

Today, I was at school, and I had a suprise control over the tales
But it was a lesson about imaginary stories.
Then, I have invent a tale whose title is "The orphan is the Frog".
She was mistreated by the kitchen keeper of the orphanage.
She went to market to buy him the fruit and vegetables. She found a scarf and knew he had flown. She was lost. She found a talking frong, etc....
I hope that I had a good rating.

[Good job.  Remember your capitalization.]