1 . Only after talking to two students_______that having strong motivation was one of the biggest factors in reaching goals.

A．I did discover

B．did I discover

C．were I discovered

D．I discovered

2 . At the meeting place of the Yangtze River and Jialing River ________, one of the ten largest cities in China.

A．lies Chongqing	B．Chongqing lies
C．does lie Chongqing	D．does Chongqing lie

3 . Only then did he             the effects of his action.

A．aware

B．aware of

C．become aware

D．become aware of