They are all correct ,and Chinese characters just like English words can use in many different ways, so "这么' "那么" use as a adverb, and the "怎么" is like "how", a tone of question.

I don't see anything wrong with the sentences you typed. They are fine.

怎么这么 = how it can be so... 怎么 = how 这么 = so your sentences are exactly correct.

these sentences are so good! come on

怎么是表示在你不知道的情况下所站的角度，这是你判断的角度不理解的角度说的。