Problem: How does the sentence end?

The girl wanted to get married at the church instead of at the park because the 
Answer: church was more formal.

Problem: How does the sentence end?

Justin asked Christopher if they knew a good hair dye, because 
Answer: Christopher frequently dyed their hair.

Problem: How does the sentence end?

Adam needed to trim their nails while Craig did not because the nails of 
Answer: Craig were quite short.

Problem: How does the sentence end?

Kenneth had a clear vision point while hunting but not Jeffrey because 
Answer:
Jeffrey lost the night vision gear.