The old man has something wrong with her eyes and has to have them_______.
We should often keep _____ touch with each other, because we are good friends.
—What do you think this coat is made _____? —Wool. It’s used for _____.
—Do you know _____? —Sorry, I don’t know.
_____ the morning of December 1st, 2006, the 15th Asia Games _____ in Doha(多哈).
There are fifty students in our class, _____ of us _____ football.