Between the two windows was taken 10 years ago.
| A．a picture hangs that | B．a picture hanging which |
| C．does a picture hang which | D．hangs a picture that |
Much time _____ sitting at a desk, office workers are generally troubled by health problems.
| A．being spent | B．having spent |
| C．spent | D．spending |
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 |
I’m so ______ to all those volunteers because they helped my terrible day end happily.
| A．special | B．superior |
| C．grateful | D．attractive |
A ship in harbor is safe, but that’s not ______ ships are built for.
| A．what | B．whom | C．why | D．when |