Problem: How does the sentence end?

The windows were replaced by doors to prevent wasting energy, since the 
OPTIONS:
- windows were well insulated.
- doors were well insulated.
Answer: doors were well insulated.

Problem: How does the sentence end?

Christopher wasn't a plumber but he knew Matthew was so 
OPTIONS:
- Christopher called him to fix his sink.
- Matthew called him to fix his sink.
Answer: Christopher called him to fix his sink.

Problem: How does the sentence end?

The violent movie was so graphic that we switched theaters and went to a romance instead.  The 
OPTIONS:
- movie was something we just hated to see.
- romance was something we just hated to see.
Answer: movie was something we just hated to see.

Problem: How does the sentence end?

Jessica found that she enjoyed watercolor painting more than oil painting, because the 
OPTIONS:
- watercolor paints were cheaper.
- oil paints were cheaper.
Answer:
watercolor paints were cheaper.