Problem: How does the sentence end?

Jason was excited to share the plot of the new short story with Samuel because 
Answer: Jason wanted advice.

Problem: How does the sentence end?

Brett is able to look at the stars more often than Hunter because 
Answer: Hunter doesn't own a telescope.

Problem: How does the sentence end?

The man tried to put the bed into the room but the 
Answer: room was too small.

Problem: How does the sentence end?

So 
Answer:
Robert enjoys reading books because Robert spends a lot of time with books and Aaron outside.