Problem: How does the sentence end?

Rebecca probably has millions more subscribers than Sarah because
Answer: Sarah has been famous for a shorter time.

Problem: How does the sentence end?

I used vinegar on a carpet stain today, but now my room smells terrible since the
Answer: vinegar is too strong.

Problem: How does the sentence end?

Michael put more effort into their relationship than Jason, because
Answer: Michael was more invested in its success.

Problem: How does the sentence end?

So
Answer:
Kayla has little goals in life Natalie wants to succeed in life and Kayla just doesn't care as much.