Well saying dunno is an error in formal/academic writing. In academic writing you would have to write, i do not know, though.
You should address the counterargument in the second paragraph.
Answer:
indicate a sudden change in thought
Explanation:
"The dash (–) is used to set off additional material within a sentence, often in order to emphasize it, to set off appositives that contain commas, or to indicate missing words."
Cause she is scare and worried Betty might actually die
