If a student has a problem with classroom work，he or she should______.

If a boy or a girl has grown up in a home with sharing tasks and decisions，he or she will probably______.

29．__________ when you are on the bus or bike．

Mr. Grey has two sons,______ are famous dancers.

— Which city has _________population, Beijing, Guiyang or Nanchang?

— Beijing, of course.

：不管外界对大学英语四、六级考试有怎样的非议，每年的四、六级考试还是_________地进行着，不少高校的学位证书仍然与大学英语四、六级考试挂钩着，大学英语四、六级考试成绩依然神气着……当大学英语四、六级考试_________成只为一纸证书考试时，大学英语四、六级考试就已经变得_________了。 填入画横线部分最恰当的一项是（ ）。

不管外界对大学英语四、六级考试有怎样的非议，每年的四、六级考试还是________地进行着，不少高校的学位证书仍然与大学英语四、六级考试挂钩着，大学英语四、六级考试成绩依然神气着……当大学英语四、六级考试________成只为一纸证书考试时，大学英语四、六级考试就已经变得________了。填入划横线部分最恰当的一项是（ ）。

______ it or not , his discovery has created a stir in scientific circles.

David Beckham has ______ sons. Brooklyn Beckham is his ______ son.

Mr.Joe has worked very hard in the past two years and has paid all his debts_________ the last penny.

The ball _____ two or three times before rolling down the slope.