Problem: How does the sentence end?

I removed the shower curtain from the tub and replaced it with a shower door. The 
OPTIONS:
- curtain was old.
- door was old.
Answer: curtain was old.

Problem: How does the sentence end?

It was difficult to hear the ringing of the phone over the radio because the 
OPTIONS:
- phone was too loud.
- radio was too loud.
Answer: radio was too loud.

Problem: How does the sentence end?

Betty told a crazy story about a wild duck to Mary, because 
OPTIONS:
- Betty needed someone to hear the story.
- Mary needed someone to hear the story.
Answer: Betty needed someone to hear the story.

Problem: How does the sentence end?

The clown had different tricks up his sleeve for the children and used the cards but not the balloons because the 
OPTIONS:
- cards were ordinary.
- balloons were ordinary.
Answer:
balloons were ordinary.