题目内容：

短文改错

Dear Tom,

I'm writing to apologize to you for not replying to your email in time. Last week I was so engaging in my lessons that I had no time to do other things. Now I want to tell you my arrangements for summer vacation.

Doing part-time jobs are my first plan, from which I can benefit a lot. I can acquire of some social experiences, not to mention earn money. Then I will visit Tibet with a few friends, where we can experience a complete different culture. The journey can't be impressive, full of challenges. Finally, serving as a volunteer is other thing I want to do. I will attend to the old or alternatively, helping the police direct traffic. They believe I'll spend a significant vacation.

Li Hua