一次难忘的经历英文作文怎么写

An unforgettable experience
Usually,the first time you did something is unforgettable,although it couldn't be always wonderful.
As for me,an unforgettable experience of mine is the first time I joined the Red Cross.We took boxes,and walked on the street.We found some people on the street,then asked them to raise some money for Red Cross.At first,we were so surprised that just a few people would raise some money for Red Cross,and some people even thought we were cheat!But we weren't upset.We went on and worked for the whole day.
During that day,we all felt tired but happy,because we raised much money.We looked at the boxes and smiled.
It's really an unforgettable experience!