Problem: How does the sentence end?

Felicia pulled ahead of Rachel while swimming because 
Answer: Rachel was swimming slower than everyone else.

Problem: How does the sentence end?

John's new dog bed would not fit in his old dog house, the 
Answer: house was too small.

Problem: How does the sentence end?

Temptation was difficult for Sarah to avoid but not Erin. 
Answer: Sarah was had a weak will.

Problem: How does the sentence end?

Samuel was more interested in knowing how things worked than Ryan because 
Answer:
Samuel had a curious nature.