Not once________to Michael that he could one day become a top student in his class.
(2013·湖南，35)
A．occurred it B．it did occur
C．it occurred D．did it occur
The university estimates that living expenses for international students________around $8,450 a year，which________a burden for some of them. (2013·湖南，33)
A．are；is B．are；are
C．is；are D．is；is
At no time________the rules of the game.It was unfair to punish them.(2013·辽宁，26)
A．they actually broke
B．do they actually break
C．did they actually break
D．they had actually broken
________small，the company has about 1,000 buyers in over 30 countries.(2013·天津，5)
A．As B．If
C．Although D．Once
Only by increasing the number of doctors by 50 percent ________ properly in this hospital. (2013·大纲全国，32)
A．can be the patients treated
B．can the patients be treated
C．the patients can be treated
D．treated can be the patients
It was only after he had read the papers ________ Mr.Gross realized the task before him was extremely difficult to complete. (2013·大纲全国，30)
A．when B．that
C．which D．what
