Who ______ the fight against the H1N1 flu ______ it not been for the Chinese scientists’ great efforts?

Ann is in hospital—Oh, really? I _____ know ,I ____ go and visit her

himself with necessary knowledge and skills, theyoung man went to the job market with much confidence.

Where is the library– It’s_____ a classroom.

________ for the fact that she broke her leg,she might have passed the exam.