Problem: How does the sentence end?

Bob wanted to cut the watermelon open with a  knife, but the 
Answer: watermelon was just too tough.

Problem: How does the sentence end?

Christine was very suspicious of Samantha because 
Answer: Samantha tried to steal her boyfriend from her.

Problem: How does the sentence end?

The chairs weighed down the pallets more than the tables did because the 
Answer: chairs were heavier.

Problem: How does the sentence end?

Megan was feeling more tired than Samantha because 
Answer:
Megan had danced more at the party.