The meticulous carpenter used the sandpaper to sand the wood until the 
OPTIONS:
- wood was smooth.
- sandpaper was smooth.
wood was smooth.

Neil was able to buy the appliances cheaper than Aaron because 
OPTIONS:
- Neil had a coupon.
- Aaron had a coupon.
Neil had a coupon.

The problem at the conference could not be accurately identified because the 
OPTIONS:
- problem was complex.
- conference was complex.
problem was complex.