But I did not know where to begin.

VOA: special.2010.01.30

Yes, it's 7. So, I don't know if this is true or not, but I wonder if that's where the actual name 7-Up came from.

对，是七，我不知道这是不是真的，但是我怀疑这才是,七喜名字的真正来源。

麻省理工公开课 - 化学原理课程节选

I was trying to find it but I did not know where I should look.

我试图自己找到这个银行，但不知从何找起。

Is there 课堂 - SpeakingMax英语口语达人