________ Yao Ming has retired from the NBA，the pleasure we have got by watching him play basketball at home and abroad will last long.
| A．Although | B．If |
| C．Since | D．Once |
Only when the govern
ment increases affordable homes for low-income groups______.
| A．the imbalance of demand and supply can be removed |
| B．can be removed the imbalance of demand and supply |
| C．can be the imbalance of demand and supply removed |
| D．can the imbalance of demand and supply be removed |
Not until________,_________.
| A．did she take off, I realized | B．she took o ff, did I realize |
| C．did she take off, did I realize | D．she took off, I realized |
It was in the factory _________ his friend worked _______ he picked up a lot of experience.
| A．where, where | B．that, where | C．that, that | D．where, that |
It is the film _______ director is Steven Spielberg _______ attracts quite a few viewers throughout the world.
| A．that; who | B．which; that | C．whose; that | D．whose; who |
——Where did you come across our chemistry teacher ?
------ It was in the supermarket ______ I purchased mooncakes.
that B. which C. where D. when