Yes. For example, "They had no idea what I was contemplating."
I'm contemplating an answer to your question.
I'm contemplating the answer again.
I often use a WONDERFUL RANGE of vocabulary when contemplating answering queries.
The Tagalog word for contemplating is "pagmumuni-muni."
Yes. There is no English word that cannot end a sentence.
noA sentence cannot end with the word "the". Hmmm, wait a minute.
The word "incidentally" can be used at the end of a sentence. You can make the sentence "This was done incidentally.".
no it doesn't because it is a punctuation not a word
No, if you end a sentence with the word of, it would be an incomplete sentence. There will always be other words or at least one word that follows the word of in a sentence.
He was contemplating the shimmer of light on the water.
No.
It may be. There is no word in English that cannot begin or end a sentence. The idea that certain word are unfit to end a sentence comes from Latin grammar, not English.