—It is said that Nanjing Metro Line 3 ________ at the end of 2014.—That’s great! It will be much easier for more people to go out.
My storybook is ______ of the two.
She ______ know the answer, but I’m not sure.
--- Why don’t we go climbing tomorrow? --- ___________
The little girl kept _____ the house, because she wanted to keep it _____.
___________ the three questions, which one is the most difficult to answer?