"He" is not my friend

I had just cleaned my class that time, and I was going to wash

my hand with my best friend. Just call her Caca (not her real name).

But suddenly one of my classmates, Nina (also not her real name)

called us. She also wanted to wash her hands. Because Caca and I

wanted to tease her, we run away and left her. Then, we hid in 

the store room of my school. We wanted to make Nina shocked,

when she was passing store room.

We were waiting for a moment. Just then, someone opened

store room’s door. Caca and I prepared ourselves to shout as loud as possible.

When someone entered the room, we were shouting

together. And we were so shocked, because someone who

entered store room was not Nina. He is my teacher.

I said sorry to him, but he had got angry. Finally he gave us

punishment. He asked us to help him cleaned computer

laboratory. Nina laughed at Caca and me loudly. I was so

embarrassed to her and my teacher.