Problem: How does the sentence end?

Brett had always wanted to have a career but Lawrence wanted to be a homemaker. 
Answer: Brett went to college.

Problem: How does the sentence end?

He had went to his front lawn so he could finally mow it with the lawn mower, but was unable to because the 
Answer: lawn was too overgrown.

Problem: How does the sentence end?

Jennifer asked Rachel what color the trousers were trimmed with, but 
Answer: Rachel didn't know.

Problem: How does the sentence end?

Aaron needs help from Neil with testing the specific gravity, because 
Answer:
Aaron knows nothing about specific gravity.