Congratulations! You’ve got the first prize in the EnglishContest.—_____ it be true? It’s unbelievable!

Would it be ___________ for you to pick me up at four o’clock and take me to the airport?

CanI help you, madam—I’dlike to buy ____eggs.

下列各句中，加点成语使用恰当的一项是

So between 1510 and 1514 Copernicus worked on it, gradually _____ his theory until he felt it was complete. [ ]