Mishap
Error
Accident
It was a mistake to ask your grandmother her age.
mistake
my love, my dear friend,
There is no such word, if you wanted you could use sinking or sink or sinks
Error 404
Mistake, perhaps.
One word you could use is 'kiosk'.
Another word, that can be used in place of Almost, is Nearly. You could also use About, or just about.
You could use envy or want in place of begrudge.
seat
What you could do is take a piece of paper and glue it over your mistake or if you have white nail polish handy you could use the nail polish lightly over your mistake
You should use the word "where" is a sentence when refering to a place or location. For an example: "Where were you going?" Which you could also ask as "To which place were you going?"