一Didn't you see the red light？
一Sorry，sir.I （check） the map and didn't notice it.
People are advised （keep） a distance of 6 feet or more in public places.
The world （not face） such a big challenge since World War II.
Come on!Go ahead，or you （regret） it for the rest of your life.
There are many places on the earth that are still （known） to humans.