[Q]: How does the sentence end?

Aaron asked Derrick when the college bookstore closed on Friday but 

[A]: Derrick did not know.


[Q]: How does the sentence end?

The students don't like the methods that are taught compared to other techniques, because the 

[A]: methods are more difficult.


[Q]: How does the sentence end?

Jason showed Steven the proper techniques in order to care for Rayon.  

[A]:
Steven was grateful.