小题1:Paul tried to open the door but it didn't work.（改为同义句）

Paul tried to open the door but    ▲  .

小题2:I want one kilo of fish.（对划线部分提问）

   ▲      ▲      ▲   of fish do you want?

小题3: The news report is very exciting.（改为感叹句）

   ▲      ▲   exciting news report it is l

小题4: His mother came home. Then he stopped watching TV.（合并为一句）

He    ▲   TV    ▲   his mother came home.

小题5:the, kites, she, in, flies, Ben, park, with, often (.)（连词成句）

                                    ▲                             

如图所示，一个电量为+Q的点电荷甲，固定在绝缘水平面上的O点．电量为-q、质量为m的点电荷乙从A点以初速度v₀沿它们的连线向甲运动，到B点时速度最小且为v．已知静电力常量为k，点电荷乙与水平面的动摩擦因数为μ，AB间距离为L．则

A．OB间的距离为

B．从A到B的过程中，电场力对点电荷乙做的功为

C．从A到B的过程中，电场力对点电荷乙做的功为

D．在点电荷甲形成的电场中，AB间电势差