Answer:
Please
Explanation:
That best completes the sentence
Because back then they believe that if they didn't see it then it is not there or created for example when the french believe that the earth is flat but we know now that it is round.
Cannot is formal, while can't in informal.
"Cannot" and "can not" are interchangeable, but when you are asking question for example:
"why can't I...", you can also say "why can I not..." (which is more formal), but you can't say "why cannot I..."
Note citations and parenthetical citations
