sentence: She would rather teach others to play the guitar than to play the flute since the OPTIONS:
- guitar is easier to learn.
- flute is easier to learn.
complete: guitar is easier to learn.

sentence: I used a wine bottle to pour some wine into a wine glass, because the OPTIONS:
- wine glass was empty.
- wine bottle was empty.
complete: wine glass was empty.

sentence: John complained about leg pain whenever he walk to the school but not when he walk to the church. It turns out the OPTIONS:
- school is far.
- church is far.
complete:
school is far.