I am interested ________ sports.I often play soccer and I am ________ a soccer team.
— My son seldom has breakfast. — It is unhealthy habit. You must ask him to change it.
The doctor _______ on the man and _______ saved his life.
Students can’t be made ____________ all day.
You know great changes _____________ in our school in the past ten years.
Paul doesn’t know _________ about his problems.