Problem: Matthew prevented more balls from passing them than Brian because

My choice: Matthew was a better ball player.

Problem: rhododendrons are easy to prune but roses are not because the

My choice: roses are very ill natured.

Problem: They wanted to move house but struggled to find a buyer in this market, because the

My choice: house was so expensive.

Problem: Amy couldn't stop itching after being around Monica all day, because

My choice:
Monica infected them with lice.