[Q]: How does the sentence end?

Brian was overweight but Nick wasn't overweight because 

[A]: Brian ate a large amount of calories.


[Q]: How does the sentence end?

Joel showed Randy how to pack for college before the first day because 

[A]: Joel is a senior in college.


[Q]: How does the sentence end?

When Cynthia messed up his research, Megan giggled, so the professor gave 

[A]:
Cynthia a sympathetic look.