Problem: How does the sentence end?

Donald needed Brians help fixing the electric motor, but
Answer: Brian had no idea what he was doing.

Problem: How does the sentence end?

Steven was more interested in planning his vacation than Justin because
Answer: Justin had never wanted to travel.

Problem: How does the sentence end?

The skateboard traveled faster than the skates did because the
Answer: skates had much rougher wheels.

Problem: How does the sentence end?

Adam wanted to support Steven during their difficult time, so
Answer:
Adam offered a lot of encouraging words.