Although ______ for many years, the two old sisters recognized each other at once.
Tom and Jack went ______ they could find work.
He wrote his first novel ______ studying in a university.
The doctor ______ she sent her friend is very famous.
The old lady ______ the girl ten Yuan for washing windows, most of ______ hadn't been cleaned for a long time.
The man ______ is our new headmaster.