[Q]: How does the sentence end?

Justin excitedly told Robert that he was going to take up auto racing as a career.  

[A]: Robert was worried for him.


[Q]: How does the sentence end?

Megan's memory is a lot sharper than Rebecca's is due to 

[A]: Rebecca being a lot older.


[Q]: How does the sentence end?

Lawrence really disliked brushing his teeth unlike Donald, therefore 

[A]:
Donald had wonderful breath all of the time.