— Why do you look so worried?
—My computer broke down and my essay ______ unfinished since.
| A．had left | B．has left | C．has been left | D．was left |
Angela and John picked up the marriage ____ after they met online several times, which was not sensible．
| A．acquisition | B．identification | C．certificate | D．qualification |
If he is determined to do what he wants to do, he will do so ____ what others think of him．
| A．on account of | B．in spite of | C．regardless of | D．in case of |
Though the road covered with snow was very smooth, the old man smilingly ____ to be helped by others across the road．
| A．refused | B．declined | C．accepted | D．promised |
. Garter Druse _____ his being selected for the important task to his courage，devotion and knowledge of the area.
| A．led | B．owed | C．devoted | D．thanked |
______ it have been the failure to pick up directions from the ground control that caused the air crash?
| A．Must | B．Could | C．Would | D．Should |