Mary is the only one of the teachers who __________ a little Chinese because she is one of my friends who __________ been to China.
---- Shall we go to the art exhibition right away? ---- _____.
_______the programme, they have to stay there for another three weeks.
--- Is Mr. Smith in the office? --- Yes,_____ he is in charge of the office,he must be there.
He moved to Germany in _____, when he was in _____.
______ the day went on, the weather got worse.