[Q]: How does the sentence end?

Tanya had been collecting art for much longer that Jessica, so 

[A]: Tanya knew  collection was more valuable.


[Q]: How does the sentence end?

Katrina was invited to be the house guest of Laura because 

[A]: Katrina needed a place to stay.


[Q]: How does the sentence end?

He was more perplexed by the puzzle boxes than the math problems, because the 

[A]:
math problems were easy to solve.