The ship would have sunk with all on board ______ for the captain.
| A．if it was not | B．had it not been |
| C．if it has not been | D．not had it been. |
Only by shouting at the top of his voice _______.
| A．he was able to make himself heard | B．he was able to make himself hear |
| C．was he able to make himself heard | D．was he able to make himself hear |
_______that he was in great danger, Eric walked deeper into the forest.
| A．Not realized | B．Not to realize | C．Not realizing | D．Not to have realized |
As a result of the serious flood, two thirds of the buildings in the area ______.
| A．need repairing | B．needs to repair | C．needs repairing | D．need to repair |
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 |
Over the past decades, sea ice in the Arctic as a result of global warming.
| A．had decreased | B．decreased | C．has been decreasing | D．is decreasing |