You can hardly imagine the difficulty the woman had ____ her children．
A．brought up B．to bring up
C．bringing up D．to have brought up
Barack Obama delivered a speech to 500 local youths during his visit to China, many of ____ from Fudan
University and Tongji University．
A．them B．whom C．which D．who
---What’s your impression of the Great Wall?
---Wonderful! Once ____ , it can never be forgotten．
A．seen B．seeing C．being seen D．saw
____ that you are chosen to be a volunteer at the London Olympic Games, what will you do?
A．Assumed B．Assuming C．To assume D．To be assumed
He didn’t regret saying what he did but felt that he ____ it differently．
A．could express B．would express
C．could have expressed D．must have expressed
If China’s space technology has achieved ____ breakthrough in this field, it really is ____ amazing wonder．
A．the; an B．a; an C．不填; the D．a; 不填
