Problem: How does the sentence end?

Stan had to choose between a glass or plastic tank to house his crickets, and he chose the 
Answer: plastic because it was lighter weight.

Problem: How does the sentence end?

James needs another pot for the flower as it grows. The 
Answer: flower is getting too big.

Problem: How does the sentence end?

Megan put on blue latex gloves to examine Christine because 
Answer: Christine was the patient in that room.

Problem: How does the sentence end?

Lindsey tried to train their puppy on their own but Elena hired a pro. 
Answer:
Elena had a well-behaved puppy at the dog park.