[Q]: How does the sentence end?

The boy knows how to use commas, but can't figure out apostrophes, so the 
OPTIONS:
- commas are demanding to learn.
- apostrophes are demanding to learn.

[A]: apostrophes are demanding to learn.
QUES: Continue writing.

There was a lot more tension in the rope than in the net, because the 

OPTIONS:
- net was loosely hanging.
- rope was loosely hanging.
+++++++++
ANS: net was loosely hanging.
Problem: How does the sentence end?

Andrew loves to exercise he plays soccer with a ball on Fridays and hockey with a puck on Mondays. The 
OPTIONS:
- ball was used on his game on Monday.
- puck was used on his game on Monday.
Answer: puck was used on his game on Monday.
sentence: Joseph kept defeating Nick every time they played, so  OPTIONS:
- Joseph wanted to keep playing together.
- Nick wanted to keep playing together.
complete: Joseph wanted to keep playing together.
Aaron was really upset that they had treated their friend Ian badly, so to make it for it 
OPTIONS:
- Aaron accepted a gift from them.
- Ian accepted a gift from them.
Ian accepted a gift from them.
Problem: Continue the following story.

He ran into the building after he heard the siren go off. The 
OPTIONS:
- siren was safe.
- building was safe.
Here's how I want to continue it:
building was safe.