It is demanded that the plan _____ out as soon as possible.
| A．must be carried | B．is to carry out | C．carried | D．be carried |
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 |
____ no cash for food, he broke into an old woman's house, hoping to steal some money.
| A．Because | B．As | C．Since | D．With |