Problem: How does the sentence end?

Michael put more effort into their relationship than Jason, because 
OPTIONS:
- Michael was more invested in its success.
- Jason was more invested in its success.
Answer: Michael was more invested in its success.

Problem: How does the sentence end?

John used the megaphone instead of the microphone to amplify his voice. The 
OPTIONS:
- megaphone was quieter.
- microphone was quieter.
Answer: microphone was quieter.

Problem: How does the sentence end?

He tried to put the iron in the box but the 
OPTIONS:
- iron was too big.
- box was too big.
Answer: iron was too big.

Problem: How does the sentence end?

During the recording session the artist didn't make a sound out of the drum but instead used the flute because the 
OPTIONS:
- drum was broken.
- flute was broken.
Answer:
drum was broken.