[Q]: How does the sentence end?

The groundskeeper replaced the filter in the pond. He could see that the 

[A]: filter was full.


[Q]: How does the sentence end?

The research that I did for my essay was not enough because the 

[A]: research was minimal.


[Q]: How does the sentence end?

Nick goes to sleep earlier than Brett because 

[A]:
Brett goes to work later in the morning.