[Q]: How does the sentence end?

The workout routine was beneficial to Donald but not Samuel because 

[A]: Samuel was not developing any muscles.


[Q]: How does the sentence end?

I like the rural towns better than the urban city because the 

[A]: rural town is friendlier to strangers.


[Q]: How does the sentence end?

Nelson forgot to charge the battery on their phone but Kevin remembered to charge theirs. 

[A]:
Kevin used their cell phone to call a cab.