Problem: How does the sentence end?

Eating ice cream was Patricia's favorite thing to do but Christine can't eat ice cream because 
Answer: Christine is lactose intolerant.

Problem: How does the sentence end?

Sarah was tone deaf while Betty was a singer, so 
Answer: Sarah sounded terrible when singing karaoke.

Problem: How does the sentence end?

Lawrence installed the cabinet in a quicker time than Justin because 
Answer: Lawrence was a carpenter.

Problem: How does the sentence end?

The man found less clams at the beach than oysters, because the 
Answer:
oysters were abundant.