I think you did really good this was a really eye opening topic really the only thing I have to say is you might want to change to summarize to to conclude it sounds more appealing other than that I don't really have any corrections.
I'm almost 100% sure its To Come, for it sounds the most like an infinitive verb.
It would be a diamond shape because it can have four sides that are equal but the angles have to be non equal to make it a diamond so a diamond is your answer
He doesn't want watson or anybody to know about his tricks
