AIDS is said_______ the biggest health challenge to both men and women in the earth over the past four years.
—So you didn’t say hello to him last night?—Well, I stopped and smiled when I saw him, but he_______ me and walked on.
It’s the third time ________ late for school this week.
Money plays______ important role in the material world. But expecting ______ money to give happiness may be missing the meaning of life.
It is reported that ______ number of college students ______ growing year by year.
She would rather(宁愿) have a room ______ than sleep with her sister.