Sentence:  On my first Guy Fawkes Day here , I found Catholics as well as non Catholics celebrating with the traditional fireworks and bonfires , and was told that most Englishmen either do not <WSD>know</WSD> or are not concerned with the historical significance of the day . 
Meaning of the word marked with <WSD> tags:  be cognizant or aware of a fact or a specific piece of information; possess knowledge or information about