Answer:
All of a sudden
Explanation:
All of a sudden is a transition that shows suspense. It says something happened, but not with any warning and it doesn't tell the reader up front what went on or if it was good or bad.
Some replacements for negligence is carelessness, failure, and neglect
The answer to #1 is D.
The answer to #2 is C.
The answer to #3 is A.