Only when their children leave home _________.
| A．many parents did feel a sense of loss | B．did many parents feel a sense of loss |
| C．did feel many parents a sense of loss | D．do many parents feel a sense of loss |
Schools should be lively places where individuals are encouraged to _____ to their greatest potential.
| A．accelerate | B．improve |
| C．perform | D．develop |
The number of smokers,（） is reported, has dropped by 17 percent in just one year.
| A． | it | B． | which | C． | what | D． | as |
—Go and say sorry to your Mom, Dave.
—I’d like to, but I’m afraid she won’t be happy with my ______ .
| A．requests | B．excuses |
| C．apologies | D．regrets |
Many of the things we now benefit from would not be around _______ Thomas Edison.
| A．thanks to | B．regardless of |
| C．aside from | D．but for |
________ ourselves from the physical and mental tensions, we each need deep thought and inner quietness.
| A．Having freed | B．Freed |
| C．To free | D．Freeing |