---He seems to be a teacher.---______. He has been a teacher for 20 years.
The children all turned ______ the famous actress as she entered the classroom.
Edward, you play so well. But I ______ you played the piano.
She brought with her three friends, none of ______ I had ever met before.
I tried phoning her office, but I couldn't ______ .
His sister left home in 1998, and ______ since.