[Q]: How does the sentence end?

Knowing the gender of the fetus was important to Monica but not Erin because

[A]: Erin wanted to be surprised.

[Q]: How does the sentence end?

The students took a longer time calculating the physics problem than the engineering problem since the

[A]: engineering problem was rather intuitive.

[Q]: How does the sentence end?

Michael absolutely refused to accept the apology that Kyle offered to them, because

[A]:
Michael was stubborn.