Problem: How does the sentence end?

Jessica enjoyed drinking lots of milk but Betty avoided it, as 
Answer: Betty was intolerant of lactose.

Problem: How does the sentence end?

The baby took formula but had to switch to breastmilk because the 
Answer: formula hurt his belly.

Problem: How does the sentence end?

Kyle was more experienced and self confident than Jason was, because 
Answer: Kyle was not a virgin.

Problem: How does the sentence end?

Jenny recycled her old laptop and bought a desktop computer, because the 
Answer:
laptop was too slow.