Answer:
Jillian couldn't have cared less about the score of the hockey game.
Going to school is preferable to going to work.
Unsure about 3.
A journalist is stimulated by his or her deadline.
The last question depends on context. It's probably "When drivers have been drinking, they are more likely to speed," but everything else except D is also technically correct.
Step-by-step explanation:
1: It's not A because "could" means a possibility, but "haven't" means no possibility. It's not D because that means she cares the most. It's not C or E because that means she cares a little and is able to care less.
2: It's not A because that has the opposite meaning. It's not B or E because those are missing words. It's not C because that word has a different meaning.
4: It's not A because "a" is singular but "are" is plural. It's not B because journalism is the subject, not the person. It's not C because "journalists" is plural but "is" is singular. It's not E because "journalists are" is plural but "his or her" is singular.
5: It's not D because "someone" is singular, so "have" doesn't match.