There __________ a teacher and seventy—two students in the classroom.

You like the portable personal computer so much. Why not buy one—Well, I can’t afford ___ computer at present.

s a _____ inour office that when it’s somebody’s birthday, they bring in a cake for us a llto share

Martin was once ________ “problem student”, but nowhe’s one of ________ top students.

It was not until Susan came back ______her close friends were waiting for him.