Experiments of this kind __________ in both the U. S. and Europe well before the Second World War.
| A．have conducted |
| B．have been conducted |
| C．had conducted |
| D．had been conducted |
The newspaper says that the BBC will be________the match live from Paris.
| A．calculating | B．performing |
| C．broadcasting | D．inspecting |
The pencil fell off the table and went _______across the floor.
| A．affecting | B．rolling | C．sorting | D．earning |
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 |