[Q]: How does the sentence end?

Authorization to enter the government building was granted to Adam but not Kevin because

[A]: Kevin had inadequate credentials.

[Q]: How does the sentence end?

Randy suffers from very bad headaches but Joseph does not.

[A]: Joseph went to the store to get some flu medicine.

[Q]: How does the sentence end?

This was important to Sarah but Megan did not care , so

[A]:
Sarah ended up putting all the effort into it.