These old buildings possibly ____ the Ming Dynasty.
It is thought that one billion people I the world,________is half the word’s workers, earn their living by farming.
I can’t find my watch. I must have ________it in the hotel.
Is Mr. Wang good at drawing his students into ________ discussion?
_________side of the street is lied with different shops, _________of which sell electronic products.
Only when _____ possible to settle the problem.