_______ we are doing now has never been done before.
| A．That | B．What |
| C．Which | D．Whether |
Milton didn’t chooseof the T-shirts and went away without looking at a third one.
| A．any | B．either | C．all | D．both |
No government can justly claim authority it is based on the will of the people．
| A．after | B．unless | C．so that | D．while |
The music sounded， the end of the class．
| A．indicating | B．indicated | C．to indicate | D．indicate |
Carbon
dioxidefrom burning fuels is the most common of the so-called greenhouse gases.
| A．produced | B．producing | C．to be produced | D．having been produced |
Staring at the priceless diamond amazement, Mary dreamt of getting one．
| A．with | B．by | C．at | D．in |