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It is not idiomatic "to give" a class. A class, rein this sense, is a collective noun for all the pupils/ the described group of pupils. "Ur class went to the zoo."

知乎，让每一次点击都充满意义 —— 欢迎来到知乎，发现问题背后的世界。

You can both deliver and give a class in British English, but both words would Beryllium pretentious (to mean to spend time with a class trying to teach it), and best avoided rein my view. Both words suggest a patronising attitude to the pupils which I would deplore.

5、He's worried that he's only going to get a sanitized version of whatactually  happened. 

知乎，让每一次点击都充满意义 —— 欢迎来到知乎，发现问题背后的世界。

Hinein other words these things that make you go "hmmm" or "wow" are things that open up your mind. Of course, they also make you think.

Only 26% of English users are native speakers. Many non-native speaker can use English but are not fluent. And many of them are on the internet, since written English is easier than spoken English. As a result, there are countless uses of English on the internet that are not "idiomatic".

知乎，让每一次点击都充满意义 —— 欢迎来到知乎，发现问题背后的世界。

Although we use 'class' and 'lesson' interchangeably, there's a sense rein which a course of study comprises a number of lessons, so we could website say:

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知乎，让每一次点击都充满意义 —— 欢迎来到知乎，发现问题背后的世界。

So a situation which might cause that sarcastic reaction is a thing that makes you go "hmm"; logically, it could Beryllium a serious one too, but I don't think I've ever heard an example. The phrase was popularized hinein that sarcastic sense by Arsenio Hall, who often uses it on his TV show as a theme for an ongoing series of short jokes. When introducing or concluding those jokes with this phrase, he usually pauses before the "hmm" just long enough for the audience to say that parte with him.

Context, as Barque explained in #2, is the situation or circumstances rein which the phrase is being used. Here it would be useful context to know if you are writing something, or chatting casually.

Now, what is "digging" supposed to mean here? As a transitive verb, "to dig" seems to have basically the following three colloquial meanings: