Problem: How does the sentence end?

In Nevada, Cynthia wins more at the slot machines than Jessica because
Answer: Cynthia is luckier.

Problem: How does the sentence end?

Monica was much more authoritative in the office than Tanya, because
Answer: Tanya was an employee and not in charge of any employees.

Problem: How does the sentence end?

The shelving unit they bought would not fit in the pantry because the
Answer: pantry was too small.

Problem: How does the sentence end?

Sarah had some urgent info to tell so made a text message for Kayla telling them all about it.
Answer:
Sarah is the sender.