我完全不知道你在说什么。

I ___don't ___have ___a ___clue what you're talking about.

我只是不知道该带什么衣服，因为我对苏格兰的天气一无所知。

I just don't know which clothes to take with me because I ___don't ___have ___a ___clue about the Scottish weather.

说到先进技术，我父母一窍不通。

When it comes to advanced technology, my parents ___don't ___have ___a ___clue.