Although he talked half an hour, he couldn't give us a good ________ of the reason why he did it.
| A．idea |
| B．explanation |
| C．sense |
| D．understanding |
Bill suggested________a meeting on what to do for the Shanghai Expo during the vacation.
| A．having held | B．to hold |
| C．holding | D．hold |
S cientists have many theories about how the universe________into being.
| A．came | B．was coming |
| C．had come | D．would come |
As the air is being polluted，many kinds of wild animals are________.
| A．died | B．dying down |
| C．dying out | D．death |
Although the wind has________，the rain remains steady，so you still need a raincoat.
| A．turned up | B．gone back | C．died down | D．blown out |
We have every reason to believe that________2012 London Olympic Games will be________success.
| A．/；a | B．the；/ | C．the；a | D．a；a |