Problem: How does the sentence end?

She tried to put the marble in the pen cap, but she couldn't because the 
Answer: cap was too small.

Problem: How does the sentence end?

Ryan revealed the photo of the spouse cheating to Randy because 
Answer: Randy was curious about the situation.

Problem: How does the sentence end?

Megan called to invite Amy to a barbecue during the holiday weekend as 
Answer: Amy knew no one in the small town.

Problem: How does the sentence end?

Since Craig disliked trading card games while Michael loved them, 
Answer:
Craig never went to novelty stores to buy different card packs.