She seldom speaks English after class, for she was afraid __ mistakes __ grammar.
More and more trees were cut down. _____, many animals are dying out.
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).