Problem: How does the sentence end?

At school, Robert is always going to the principal's office, while Christopher never does, so 
Answer: Christopher is a good student.

Problem: How does the sentence end?

My teeth hurt more after eating the apple than the pudding because the 
Answer: pudding was softer.

Problem: How does the sentence end?

The products that my mom gave me wouldn't fit in the drawers, because the 
Answer: products were too long.

Problem: How does the sentence end?

Randy had many fake plants but Joseph loved real plants, so 
Answer:
Randy never had to water their plants.