sentence: That was a very interesting thought to put the desk on the den but the OPTIONS:
- desk was too small.
- den was too small.
complete: den was too small.

sentence: The cat could not climb up through the wall so it used the pillar because the OPTIONS:
- wall is smooth.
- pillar is smooth.
complete: wall is smooth.

sentence: The kitten of Randy is healthy, while Samuel's is sick due to OPTIONS:
- Randy giving his kitten a better diet.
- Samuel giving his kitten a better diet.
complete:
Randy giving his kitten a better diet.