In the united States, inches and _______ are still used as units of measurement.
                    举一反三
- Slavery still existed in the United States nowadays?
 - Innovation ability in the United States used to be the top in the world.
 - Most people in the United States still don’t trust surveys.
 - He has been to the United States for five years and is used to (live) ______ there.
 - Which digital cellular standard is used widely throughout the world except the United States?
 
