I would like to be a volunteer of EXPO 20xx in Shanghai in my spare time. My reasons are as follows:

First of all it is a good virtue to help others even in modern society. We all need others’ help in case we get into trouble. Secondly we are able to better ourselves by helping others because we gain valuable experience and build up our confidence while serving others. What’s more volunteering makes us feel better about ourselves thus making our life more enjoyable. More importantly we can make the world a better place to live in by volunteering to improve it.

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In summary volunteering can make a difference to our life so I think it is very rewarding to be a volunteer.