The school requested that all the students ____ school uniform on weekdays in school.
Some people like to stay at home on Sunday, but ___ like to go to the cinema.
His camera is more expensive than ___.
There is no such ___ person in the world.
According to a UN report, a third of the world population have no ______ to clean drinking water and health care.
-- Why do you look sad?--There are so many problems _____.