The father as well as his three children _____ skating on the frozen river every Sunday afternoon in winter.
Did you watch the _________ broadcast of 82nd Annual Academy Awards on TV?
Waiter: Here is the steak you ordered. Please _________and enjoy yourself. Customer: Thank you.
Paper money was in _________ use in China when Marco Polo visited the country in _________13th century.
The audience was _____ very young children so there was a lot of noise while the concert was going on.
The chairman thought _____ necessary to invite Professor Smith to speak at the meeting.