—What happened to the postman? —I don't know. He______ around here for a long time.
He knows little of mathematics,______ of chemistry.
The Chinese Education Department suggests teachers should receive ______ education to catch up with the development.
I think whoever makes ______ contributions to the company than others should get ______ income.
—Are you satisfied with what he did? —No, it couldn’t have been ______.
If there were no examinations, we should have ______ at school.