Quiz for today: Modal verbs/auxiliaries

Hey English learners. Here's another quiz that tests your knowledge of the "must have been" in a context. The phrase "must have been" is used to express a logical assumption or deduction about something that happened in the past based on available evidence. Need more help? Reach out to me.

Hi! Can you please tell me if there are any changes to make? I'm going for a casual conversational style. Many thanks! • ‎He sheepishly admitted that he hadn't really put much effort into it. • Even the loud ringing of the doorbell could not wake up the sound-asleep residents. • When I got back to the apartment, absolutely drained, I ran into some wide-awake young people on their way to a party. • Some people say that it is only conscious citizens who are doing their best to reduce climate change. • Since my sick son couldn't handle the chores, my healthy son took care of them. • I accidentally bumped into a lady on the street, and her upset husband shot me a hateful look. • The teacher was super strict and wouldn't forgive even the most apologetic student.

Did you know that Greece has more archaeological museums than any other country in the world?

A pleasant room it was as any party need desire to muster in on a cold November evening.(original) Question: Is the original complete one and grammatically correct? I guess: to muster in a pleasant room ( the " a pleasant room" for "it was a pleasant room"?)? what is the subject of the original, and its main verb? and its object? it seems to me that the original is not a complete sentence but something like: Any party need to desire to muster in such "a pleasant room as "a pleasant room" for " it was a pleasant room" on a cold November evening, but in fact, they have not mustered in. Is my guess correct? By the way I still really don't understand the original, and especially its structure.

Today in my little town it will be a traditional event in the evening. People are going to stay together over the streets, and share some food and wine, in front of big fires made with laurel. It's a beautiful occasion to celebrate the middle of the winter and to feel a warm community's sense. Are there any interesting traditional event in tour town or cities?

It was an interesting book, full of fascinating insights into human relationships. What's "insight" in this sentence. Perspective or perception or knowledge?