----Volunteering is becoming ______ popular in China. ---- Yeah. People are now aware that helping others is helping themselves.

---- I was riding along the street and all of a sudden, a car cut in and knocked me down. ---- You can never be _______ careful in the street.

History is the best teacher. It _______records the development path of each country and foretells the future to us.

Keeping healthy, with easy access to affordable medical care, is still a dream for many people, with medicine price rising ________.

Tom, you’d better find money for the rent______, or I’ll sweep you out.