Select the most appropriate word to fill in the blank and make a meaningful sentence.

There are some dates or periods of time in the history of the world that are so ________ that everyone knows and remembers them.

significant

The most appropriate word to fill in the blank and make a meaningful sentence is:

☀ significant

The sentence would read: "There are some dates or periods of time in the history of the world that are so significant that everyone knows and remembers them."

Explanation: The word "significant" means important or noteworthy. In this context, it's used to describe dates or periods of time in history that have had a profound impact and are widely recognized. The other options don't convey the same idea:

• Trivial: This word means unimportant or insignificant, which is the opposite of what the sentence is trying to convey.

• Representative: This word doesn't fit the context of dates or periods of time being widely known and remembered.

• Momentary: This word means lasting for only a brief moment, which doesn't fit the context of historical events being remembered over time.