Sad news.

Twenty-six people were dead killed in a traffic accident.
The disaster shocked in Taiwan.
But, don't hate keep you'r heart, keep hate in your heart because still world the world is still beautiful.

An Unforgettable Experience

My life is just like a string of beautiful pearl necklace, and every unforgettable experience that happened when I was a child all made the necklace more and more captivating and glittering. Now, I want to pick up one of them to share with you.
It was a morning that I found I left my pencil box at home when I got to school. ” Oh, my god! How careless I am! ” I said in a low voice. At that time, our teacher came into the classroom, gave outexamination paper and asked us to finish it during the class. I was really nervous. Looking around the classroom, I found the class all started to write, but I just sat there and never wrote a word.
“ Why don’t you write? ” Said my deskmate. I told her that I forgot to bring my pencil box. “ Now, I can lend one to you! ” She said happily. Then, she opened her pencil box and gave a pen to me. Looking at her warm smile, I realized the smile is the sunshine that reaches the bottom of my heart, and it’s the warmest one I’ve never felt before.
Never have I forgotten the experience that my deskmate helped me.

...a beautiful string of pearls...

...when I was a child made...

...I had left...

"Oh my god! How careless I am!,"

...gave out examination papers and asked us to finish them...

deskmate is not really a word - we would say classmate in English

...I had forgotten...

...it's the warmenst one that I've ever felt.

I think you should work a little on your past perfect and present perfect grammar. Past perfect is often used when telling or writing a story. For example: I met my best friend in Shanghai in 2014. At that time I had lived in Shanghai for 2 years. 

可能是"have no choice but to..."?