Problem: How does the sentence end?

Arnold liked receiving the note more than the letter. The 
Answer: letter was more difficult to read.

Problem: How does the sentence end?

The guitar that I bought played better than the violin, because the 
Answer: violin was very old.

Problem: How does the sentence end?

I tossed the arugula with oil and vinegar and ate it, but tossed the lettuce in the trash, because the 
Answer: lettuce was rotten.

Problem: How does the sentence end?

Matthew told Justin the proper way for storing ginger since 
Answer:
Matthew knew they weren't doing it correctly.