The man used a lamp in his house instead of turning on the lights because the 
OPTIONS:
- lamp was more expensive.
- light was more expensive.
light was more expensive.

Michael kept their motor well maintained but Dennis ignored their engine maintenance. 
OPTIONS:
- Michael saved a lot of money on car repairs.
- Dennis saved a lot of money on car repairs.
Michael saved a lot of money on car repairs.

I'm joining a gym to improve my strength and stamina. Running on treadmill should be good for the 
OPTIONS:
- stamina .
- strength .
stamina .