Tony ________ for the company as an engineer for two decades. Now he teaches mechanics in Peking University.
The young man couldn't afford a new car. __________,he bought a used one.
It is not socially __________ for parents to leave children unattended at that age.
He was a good student and scored __________ average in most subjects.
We made up our minds to study hard __________ we could be admitted into university.
The rescue work __________three parts, of which saving the people's lives is the most important one.