Sentence 4 about year round schooling helps students learn and retain more seems not to be backed up with the evidence and that it may just be a supposition as a better approach might be to coampare the pros and cons of each and at least include the importance of students having a break to rest their brains as constant schooling could become oppressive.
Don't we need the possible answers?
The polka is a livelier dance than the rumba.
Livelier.
When a writer attempts to describe something so that it appeals to our sense of smell, sight, taste, touch, or hearing