联合国的英文缩写是 。
—Do you think it will be cool tomorrow? — ______. It has been too hot for a week.
— Who’s singing in the next room? — It ____ be her . She has gone to New York.
— Do you know _____? — Next Sunday.
— What kind of movies do you like? — I like the movies ____ are about Chinese history.
We should never ____till tomorrow what we can do today.