--Do you have enough students to clean the laboratory? --No, I think we need____________ students.
—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.
—Hi, Lucy. Have you finished your homework yet? —No, just a half. I am really bored with so much homework. —_____