Problem: The performance was discarded but the rehearsal was committed to tape.  Strangely, the 
OPTIONS:
- performance was just sub-par.
- rehearsal was just sub-par.

My choice: performance was just sub-par.
[Q]: How does the sentence end?

Keeping everyone involved has always been Robert's responsibility which is now Dennis's; 
OPTIONS:
- Robert has passed the torch.
- Dennis has passed the torch.

[A]: Robert has passed the torch.
QUES: Continue writing.

Nick bought a ring from Jeffrey in the pawn shop, and 

OPTIONS:
- Nick was the owner of the store.
- Jeffrey was the owner of the store.
+++++++++
ANS: Jeffrey was the owner of the store.
Problem: How does the sentence end?

Bob poured the entire bag of concrete into the hole that he dug until the 
OPTIONS:
- bag was empty.
- hole was empty.
Answer: bag was empty.
sentence: We took the wheat out of the cattle feed and substituted rice, as the  OPTIONS:
- wheat was lacking in the proper nutrients.
- rice was lacking in the proper nutrients.
complete: wheat was lacking in the proper nutrients.
Input: Continue writing.

Samantha wants to avoid gaining weight so she asks Monica for an extra sessions, because 
OPTIONS:
- Samantha is a trainer.
- Monica is a trainer.

Continued:
Monica is a trainer.