Problem: How does the sentence end?

His legs got stronger from pulling the sled instead of pushing the block, although
Answer: sled was lighter in weight.

Problem: How does the sentence end?

It was easy to shoot the tree, but tough to shoot the target, because the
Answer: target was far away.

Problem: How does the sentence end?

Having a boyfriend suited Erin but not Betty because
Answer: Betty doesn't have a lot of free time.

Problem: How does the sentence end?

I always had trouble in University compared to school, because the
Answer:
University was very intense.