Problem: How does the sentence end?

Angela could immediately tell that the wine Emily brought to the party was corked, because 
Answer: Angela was a wine expert.

Problem: How does the sentence end?

Danika prefers pots with plastic handles over metal handles, because the 
Answer: plastic handles have better heat resistance.

Problem: How does the sentence end?

He couldn't fit his belongings in the case and had to use a sack instead, since the 
Answer: case was tiny in volume.

Problem: How does the sentence end?

Carrie fostered Mary in their home when they were young, and 
Answer:
Mary wanted to give them gratitude.