Problem: How does the sentence end?

Megan gave Rachel the new red nail polish because 
OPTIONS:
- Megan didn't have that particular color.
- Rachel didn't have that particular color.
Answer: Rachel didn't have that particular color.
sentence: The infection prone patient was moved from the ward to the private room, since the  OPTIONS:
- ward was cleaner.
- room was cleaner.
complete: room was cleaner.
Staying awake in calculus class was a problem for Katrina but not Megan because 
OPTIONS:
- Katrina was energetic about the subject.
- Megan was energetic about the subject.
Megan was energetic about the subject.
Input: Continue writing.

He preferred communicating with the phone over the computer, because the 
OPTIONS:
- phone had a clear signal.
- computer had a clear signal.

Continued: phone had a clear signal.
Story needs to be completed:
Our old bed frame broke so we went to the store to buy a new one, but they said they didn't have any at the 
OPTIONS:
- bed frame .
- store .

My choice:
store .
Problem: How does the sentence end?

The tank that John got for the fishery was not enough to get the fish into it and he ended up using the aquarium. The 
OPTIONS:
- tank is smaller.
- aquarium is smaller.
Answer:
tank is smaller.