介副词填空：Attendence at the meeting was small, due partly ____ the absencce of teachers.His health suffered from over-indulgence ____ rich food and drink.Kids should form the habit of saving money ____ a regular basis.Heavy rain caused a severe car accident, resulting _____ the death of two passengers.As a result of recession, people have learned to live ____ their means.____ principle, the new software should make the accounting system a lot simpler.