[Q]: How does the sentence end?

We couldn't get the box through the clearance in time since the 

[A]: box was tall.


[Q]: How does the sentence end?

Katrina worked out less than Samantha, however 

[A]: Katrina looked younger than the other even though they are the same age.


[Q]: How does the sentence end?

Matthew was explaining to Joseph how to properly build a fallout shelter.  

[A]:
Joseph was impressed.