找出下列句子中的错误, 并在横线上改完。
1．改错：Some students want to visit the un building in New York. ________
2．改错：What a interesting film! ________
3．改错：Here are a letter for you. ________
4．改错：Wu Yifan gives a present for his pen friend. ________
5．改错：Mike is one of my best friend. ________
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