(2013·新课标Ⅱ，12)Only by increasing the number of doctors by 50 percent________properly in this hospital.

Only when he failed the exam ________ that he didn’t work hard. (原创)

Great inventors don’t ____ graduate from famous universities. Some didn’t even go to university.

All the parents are proud ________ their children.

we have done a lot to build a low-carbon economy,yet it is still _________ ideal We have to work even harder