He had supper with us yesterday.It’s very good supper.
Students shouldn’t be given so difficult a problem ______they can not work out.
____ is clear to us all, students should obey the school’s rules.
______ time goes on,people ______ better housing and jobs.
_____, we need to imporve the equipment in our factory.
_____ writer, she is excellent, _____ teacher she is not very good.