Problem: How does the sentence end?

The cake he made for his sister's birthday party wouldn't fit on the plate because the
Answer: cake was too big.

Problem: How does the sentence end?

Jason prefers eating tangerines over oranges, because the
Answer: tangerines are smaller and easier to eat.

Problem: How does the sentence end?

Samuel taught Matthew how to calm his overactive mind because
Answer: Matthew had never done so in the past.

Problem: How does the sentence end?

Elena knocked on Laura's door so she could deliver the manual but there was no answer.
Answer:
Laura was out.