Writing (in English past tense

(If you don't l,Ike the name of the character, change it yourself)
One snowy day in Mullinger, Niall walked back home from school as usual.On the way home, he went into the library to study for the Geography test on the next day. After he'd studied for an whole hour, he borrowed some books and headed home. He walked for ten minutes, then turned left, and walked into a supermarket for some snacks to eat while studying. After that he went home happily.
In front of his apartment, Niall stuffed his hand in his backpack to search for his key. However, he couldn't find it! Niall was pretty shaken up because he couldn't go into his house if he didn't even have the key. He thought that he might left his key at school.
Niall jumped on his by circle and hurried back to school. However, he could't find anything similar to his key in the whole school campus, even in the toilet. Then, Niall went back to the library and the super market. And still he couldn't find any thing.
Niall walked back home disappointedly. In front of the door, Niall suddenly found an urge to cry out because of the frustration of being not able to fond his key. When his was about to call his mom and tell her that he was sorry he lost his key, a strong wind blew towards his direction. He dug his hands into his pocket for warmth.
Just then, Niall felt something hard and cold nod like metal. He picked that object out, just to find that it was his key! His precious key!
Niall broke into laughter and open his house's door.

2013-12-02 21:54:37 補充：
Sorry if the ending is a bit rubbish and too short feel free to correct it yourself