都可以的，“之中”比“里面”正式，一般口语说“里面”比较多

哈哈，你们英语的语法也奇怪，翻译都是调转来的

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Chinese language and culture are not like the culture of your country, your grammar and according to certain fixed patterns, but such statements are available in China, as if the Chinese say "stuff under the bed" and "stuff under the bed," although the words are different, but it is expressed by a mean, hope these help to you, I also hope that you can focus on me, we can communicate with the culture of the language, because I'm very need an English teacher, I hope we can have the opportunity to cooperation.

口语中很少使用‘之中’这个词。 better repreesntation is: 在我（自己）的朋友中/里