Dear Martin,
How are you and Sally? I hope you're well. I'm writing to give you some good news. I have got a summer job for the holidays! I am repairing telephone lines for a telephone company. I usually ride my bicycle to work because it's only a ten minute ride from home. We start work at 8:30. We finish at 4:30 on Mondays to Thursdays, but at 2:30 on Fridays, so I have long weekends. I am working very hard at the moment. To tell you the truth, I am a bit nervous because my boss is leaving for Scotland on business next week, so I'll be on my own. Lizzie says I worry about it too much. She's probably right! Please write with your news.
Say hello to Sally for me.
I think that volunteering is good. In russian it's "доброволец". If somebody is a volunteer It means that he want do something by himself. For example this person want help to someone in work , in some exercises and so on.