Problem: How does the sentence end?

The professor preferred to demonstrate the problem on a chalkboard rather than a projector, because the 
Answer: projector was less effective.

Problem: How does the sentence end?

James took the butter over the fire and poured it over the juice from the freezer. The 
Answer: butter is melted.

Problem: How does the sentence end?

William was really good with chopsticks but Steven not so much. 
Answer: William could pick up a grain of rice with them.

Problem: How does the sentence end?

The team did better running on the track than on the field because the 
Answer:
track had more friction.