[Q]: How does the sentence end?

Benjamin was essential to the overall plan Donald was putting into action, because 

[A]: Benjamin knew how to open the safe.


[Q]: How does the sentence end?

Betty really enjoyed getting up and going to their job each day but Erin did not because 

[A]: Erin was very lazy.


[Q]: How does the sentence end?

If I am giving a gift to a child I prefer books over electronics as the 

[A]:
electronics are noisy.