簡單英文文章

My English name is Liza.
I am Chinese and 15 years old.I was born in the Mainland China.I live with my parents,my elder brother and my little sister in Kowloon.My father is a clerk and my mother is a housewife.My elder brother is studying in Hong Kong University now.My little sister is studying in a kindergarten.I have been studying in XXX Secondary School since 2011.Last year, I completed F.3 successfully. I passed all subjects with merits in the year-end examinations,so I got a prize from my school.Now I am studying in F.4.I am expected the most successful student in my school.In my class, I am a monitor.Every day, before each lesson, I have to collect our homework for our teachers. I have many hobbies.However I like reading and playing badminton more.When I have time, I like to play badminton with my friends.I wish I would be a teacher one day because I can teach what I have learnt to the people.
==========================================
Last night, I was so tried that I fell asleep.
Suddenly,a horrible scream woke me up.The scream seemed to come from my neighbour.
I put on my coat and went outside.I wanted to knock on my neighbour's door,but I didn't .
I found it unlocked.Walking on tip toe,I slowly opened the door.
In the sitting room, a young couple were fighting together.
I tried my best to stop them.
Unluckily I failed.
Eventually, the young lady was hurt seriously.
The blood was coming from her head.
So I telephoned to the police at once.
After five minutes, a policeman reached the scene.
In the end, the lady was sent to the hospital and the man was arrested.
I was asked to go to the police station because I was the only one witness.
In the station, I had to report what I had seen to the police officer.
Then I returned home at about 3 o'clock.
Although I was very tired, I could not sleep because I could not forget what had happened before.

你想要的課題是什麼？

多數大概是多少？

2014-03-14 22:24:00 補充：
應是：字數大概是多少？