A．I realized

　　B．I had realized

　　C．did I realize

　　D．had I realized

　　7．We________have agreed to the plan without knowing what it would cost.

　　A．mustn’t

　　B．may not

　　C．oughtn’t to

　　D．needn’t

　　8．—Why are so many people gathering there?

　　—Several people seem ________.Let’ s go and see.

　　A．being dancing

　　B．dancing

　　C．to be dancing

　　D．to have danced

　　9．He tried hard to keep________in face of the policeman，but the sweat on his forehead gave him away.

　　A．silent

　　B．still

　　C．calm

　　D．quiet

　　10．—Tom bought a new house in the centre of the city last week.

　　—It’s not surprising.He made a________in mining.

　　A．contribution　

　　B．reputation

　　C．decision

　　D．fortune

　　11．There is a common saying in China________nothing in the world is difficult for one who sets his mind on it.

　　A．which

　　B．where

　　C．what

　　D．that

　　12．If no one________the lost bag，the person who found it can give it to the Lost and Found Department.

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