Hi everyone! Good news. A book sale.____will people drive cars in space? Will you meet traffic ____? You'll get answers from our books. Are ____ interesting for you? They can do heavy work. You ____enjoy short working hours. We've got some storybooks about them. What's the best way to buy products at very good prices? Our books will tell you something about online ____? 

    Welcome to the playground this Saturday.

    Have a nice day!

粗心的小朋友把句子弄乱了，我来帮他排一下。

____嚓的一声，画报撕坏了。

____他俩一起补好了画报，高兴奋兴地看了起来。

____老师来了，他俩抢着对老师说：“画报是她弄坏了。”

____明明和平平抢着看画报，谁也不肯让谁。

____老师说：“以后可不能这样了，快去补一补吧！”

一卫星绕某一行星表面附近做匀速圆周运动，其线速度大小为v．假设宇航员在该行星表面上用弹簧测力计测量一质量为m的物体重力，物体静止时，弹簧测力计的示数为N．已知引力常量为G，则这颗行星的质量为（   ）