缺词填空。

     Let me tell you something about Spring Festival in China. Every year people c __1__ it all over China.

   Usually it is in January or February. It is the most important f __2__ in China. So before it c __3__ ,

 every family c __4__ their houses and buy many things. And they often m __5__ a special kind of food

c __6__ dumplings. It means 'come together'. People always buy new clothes for their children and

 children also buy presents for their p __7__ . On the eve of the Spring Festival, family members meet for

  a big d __8__ . Then they watch TV until midnight. They e __9__ singing, dancing and playing cards. At

 twelve, people give e __10__ other the best wishes for the coming year.

小军体重500N，他的家距离学校2400 m，他骑自行车在水平路面上匀速直线行驶10min到校。有关数据如表中列出：求：

（1）行驶过程中，车对地面的压强是多大？

（2）小军骑自行车上学一程至少要做多少功？

（3）小军骑车的功率是多大？