30－10.3=____    1.9＋0.91=____    20÷0.25=____

8×0.75=____     0.4－0.12=____    1.25×8=____

2.1÷7=____      0.01×5=____

如图所示，水平地面上放着一重为100N的货箱．货箱与地面间的动摩擦因数为0.30．一小孩用32N的水平力拉货箱没有拉动，此时货箱受到的摩擦力大小是____N．当他用更大的水平拉力拉动货箱沿着地面运动时，货箱受到的摩擦力大小是____N．

阅读下面对话，从方框内7个选项中选择5个恰当的句子完成此对话。

Mike: What do you think life will be like in 100 years?
Bob:     ____ 
Mike: Great . Then we don't have to do any housework. The robots will help us. Will there be any
paper money?
Bob: NO, there won't.  ____ 
Mike: And I think we won't have to go to school for lessons.   ____   
Bob: I agree. Do you like traveling?
Mike: Of course. I live traveling. ____ 
Bob: You will see a more beautiful world in 100 years because the cities will be like gardens. ____    
Mike: Wow, I can't wait.