[Q]: How does the sentence end?

Jason gave Adam some chemicals to destroy the weeds in his garden. 

[A]: Adam was grateful.


[Q]: How does the sentence end?

Nelson really loved yellow birds, while Craig really loved gray ones, which explains why 

[A]: Nelson kept so many canaries.


[Q]: How does the sentence end?

When Nick declined Aaron's invitation to go out on a date, 

[A]:
Nick explained that they already had a girlfriend.