The girl sounded worse when she sang slow songs than fast ones. Her voice went better with 
OPTIONS:
- slow ones.
- fast ones.
fast ones.

To get rid of paint glaze on my wall I needed to buy sand paper to buff and an old rag to wipe it down.  The 
OPTIONS:
- paper was expensive.
- rag was expensive.
paper was expensive.

Betty is a stingy person compared to Mary, so 
OPTIONS:
- Betty will never help friends or strangers.
- Mary will never help friends or strangers.
Betty will never help friends or strangers.