Answer:
A comma
Explanation: A dependent clause is followed by a comma when it comes in the first line.
Answer:
Im guessing from pure logic. Im sorry if this is wrong but is it law(s)
Explanation:
Dear Uncle Jack is so very serious! Sometimes he is so serious that I think he cannot be quite well.
From the on top of the statement, taken from the text, it clearly tells Cecily's read regarding uncle Jack. She thinks that uncle Jack does not joke or crack a smile. She thinks he's thus serious that he can be<span> unwell.</span>