Not until he retired from teaching three years ago having a holiday abroad.
| A．he considered | B．he was considered |
| C．had he considered | D．did he consider |
After winning war in Iraq，the country fell into new worries of economy．
| A．the; the | B．a; the | C．the; ／ | D．a; ／ |
The concert _______ many foreign students were invited was a feast for the eyes.
| A．for which | B．to which | C．in which | D．on which |
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 |
Only __ as an interpreter __ how important it was to practise speaking English.
| A．when did I work...I realized | B．when did I work...did 1 realize |
| C．when I work...did I realize | D．when I worked...did I realize |
______ 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 |