Marie Curie also ________ the use of X-ray machines, ________ now widely used in hospitals.

（题文）(2015·北京)___________the early flight, we ordered a taxi in advance and got up very early.

me, sir Would you do me a favour—Of course What is it—I ________ if you could tell me how to fill outthis form

___________what his parents think, he is leaving home for a new job in a big city

__ is known to us all, our government has spared no efforts to control food prices.