Problem: How does the sentence end?

Mary ended up cleaning Kayla's disgusting room, after that 
Answer: Mary demanded payment for doing it.

Problem: How does the sentence end?

While they were exploring the inside of a huge cave, Betty got lost but luckily Sarah found her before it was too late. 
Answer: Sarah was rescuing.

Problem: How does the sentence end?

The scientists transferred the water from the bottle into the flask until the 
Answer: bottle was empty.

Problem: How does the sentence end?

The doctor tried to cure the woman of her cancer an experimental drug, but he was unsuccessful because the 
Answer:
cancer was too strong.