—Does your father smoke?
—No , it's two years __________ he smoked.
| A．before |
| B．since |
| C．after |
| D．when |
This article deals with the extent ______ family life has changed over the past 30 years.
| A．in which | B．at which |
| C．to which | D．on which |
Our school motto reflects the importance we ______ to good manners, hard work and success.
| A．place | B．attach | C．pay | D．Turn |
It’s unwise to ______ you understand something when you don’t.
| A．speak up | B．find out |
| C．make out | D．make up |
For the citizens of the world’s poorest nations, the future ______ never arrive soon enough.
| A．must | B．should | C．may | D．Can |
All his hard work ______. He was admitted into one of the best universities.
| A．turned up | B．paid off | C．put off | D．turned out |